Answers
Explanation:
(i)An analog signal has some feature that is a continuous function of the program material being transmitted. It may take on any of a range of values.
In radio, amplitude, frequency, or phase are features of the radio signal commonly modulated when transmitting an analog signal.
__
(ii)A digital signal has some feature that is a discrete function of the program material being transmitted. It may take on any of a specific set of values.
A digital radio signal typically uses some combination of amplitude, frequency, and phase to represent a discrete state being transmitted. Only specific values of these are used by the transmitter.
(The receiver generally has to deal with corruption of the signal by the transmission channel, so the received set of values may not correlate well with those intended at the transmitter. This is why error-correcting codes are often used with digital signal transmission.)
_____
Additional comment
Analog radio signals are generally transmitted using a carrier wave at a specific frequency (or in some specific frequency range, in the case of frequency modulation). Processing techniques may be used at the transmitter to limit the bandwidth used in the transmission. One commonly-used technique is to limit the transmitted spectrum to one side of the carrier wave frequency. (This is called "single side-band" radio.)
Digital signals offer the opportunity to transmit different bits of the information at different frequencies. Sometimes, "frequency hopping" is used, so that the transmitted carrier wave jumps around from one frequency to another in a predetermined pattern. The effect of this is to spread out the spectrum of the transmitted signal so that average power in any frequency band is significantly reduced. In fact, it may be indistinguishable from background noise, except by a receiver that tunes to the carrier wave in the predetermined frequency pattern.
Related Questions
can anyone help me with this please
Answers
Answer:0.99 N
Explanation:
1200 N F
|||||||||||| = |||||||||||||||||||
3.2 m2 0.0075m2
F=0.99
what amount of charge can be placed on a capacitor if the area of each plate is 7.3 cm2 ? express your answer using two significant figures.
Answers
The amount of charge that can be placed on a capacitor depends on the capacitance, which is determined by the area of each plate.
The capacitance of a capacitor is given by the formula:
C = ε0 * (A / d)
Where:
C is the capacitance,
ε0 is the permittivity of free space (a constant value),
A is the area of each plate,
d is the separation between the plates.
To determine the amount of charge, we can rearrange the formula as:
Q = C * V
Where:
Q is the amount of charge,
V is the voltage across the capacitor.
Given that the area of each plate is 7.3 cm², we can use this information to calculate the capacitance. However, the question does not provide the voltage or any other information required to calculate the amount of charge accurately. Without knowing the voltage or other relevant parameters, it is not possible to determine the exact amount of charge that can be placed on the capacitor.
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Which answer for this question is correct?
Answers
According to the question an electromagnetic wave in a vacuum moves at the speed of light.
What is electromagnetic wave?An electromagnetic wave is a type of energy that is created by the vibration of an electric field and a magnetic field. Electromagnetic waves are an invisible form of energy that can travel through a vacuum and other types of matter. They can also travel through the air and other materials, such as metal and water. Electromagnetic waves are responsible for many of the phenomena we observe in our everyday lives, such as light, sound, and radio. Electromagnetic waves have a wide range of frequencies, ranging from high-energy gamma rays to low-energy radio waves. Each type of electromagnetic wave has its own unique properties, such as wavelength, frequency, and amplitude. Electromagnetic waves are also responsible for the transmission of information through cell phones, radio waves, television waves, and microwaves.
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A car horn outdoors produces a sound intensity level LI of 90dB at 10 feet away. What is its intensity I at this first location? What is its I and LI at 20 feet away? What is its I and LI at 40 feet away? What is its I and LI at 80 feet away? What is the difference in dB at each location? ASSUME THAT THE SOUND PROPAGATES SPHERICALLY.
Answers
5Given, the sound intensity level (LI) = 90 dB, distance (r1) = 10 ft and the sound propagates spherically.We need to find the sound intensity at the first location I, and sound intensity level LI, at a distance of 20 ft, 40 ft, and 80 ft away from the source.
Using the formula to calculate sound intensity level:LI = 10 log(I/I0)Where I0 is the threshold intensity = 1 x 10^-12 W/m^2.Calculating the sound intensity at the first location I:LI = 10 log(I/I0)90 = 10 log(I/I0)9 = log(I/I0)I/I0 = 10^9I = I0 x 10^9Substituting the value of I0, we get:I = 1 x 10^-12 x 10^9 = 1 W/m^2The sound intensity at the first location I = 1 W/m^2.At 20 feet away from the source:
Using the inverse-square law formula:I1/I2 = (r2/r1)^2Where I1 = sound intensity at the first location, r1 = 10 ft, r2 = 20 ft.At 20 ft away, I2 = ?I1/I2 = (r2/r1)^2I2 = I1/ (r2/r1)^2I2 = 1/ (20/10)^2 = 1/4 = 0.25 W/m^2Sound intensity level LI at 20 feet away:LI = 10 log(I/I0)LI = 10 log(0.25/1 x 10^-12)LI = 10 log(2.5 x 10^11)LI = 10 x 11.4 = 114 dBThe sound intensity at 20 feet away I = 0.25 W/m^2 and sound intensity level LI = 114 dB.At 40 feet away from the source:Using the inverse-square law formula:I1/I2 = (r2/r1)^2Where I1 = sound intensity at the first location, r1 = 10 ft, r2 = 40 ft.At 40 ft away, I2 = ?I1/I2 = (r2/r1)^2I2 = I1/ (r2/r1)^2I2 = 1/ (40/10)^2 = 1/16 = 0.0625 W/m^2Sound intensity level LI at 40 feet away:LI = 10 log(I/I0)LI = 10 log(0.0625/1 x 10^-12)LI = 10 log(6.25 x 10^10)LI = 10 x 10.8 = 108 dB
The sound intensity at 40 feet away I = 0.0625 W/m^2 and sound intensity level LI = 108 dB.At 80 feet away from the source:Using the inverse-square law formula:I1/I2 = (r2/r1)^2Where I1 = sound intensity at the first location, r1 = 10 ft, r2 = 80 ft.At 80 ft away, I2 = ?I1/I2 = (r2/r1)^2I2 = I1/ (r2/r1)^2I2 = 1/ (80/10)^2 = 1/64 = 0.015625 W/m^2Sound intensity level LI at 80 feet away:LI = 10 log(I/I0)LI = 10 log(0.015625/1 x 10^-12)LI = 10 log(1.5625 x 10^10)LI = 10 x 10.2 = 102 dBThe sound intensity at 80 feet away I = 0.015625 W/m^2 and sound intensity level LI = 102 dB.Difference in dB at each location:LocationDifference in dBFirst location0 dB20 feet away6 dB40 feet away12 dB80 feet away18 dB
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Tech A says when checking resistance in a circuit, you need to have power connected to the component. Tech B says when you are attempting to check resistance of a component, you should have a component disconnected. Who is correct?
Answers
Both Tech A and Tech B are incorrect. When checking resistance in a circuit, you need to have the power disconnected from the component.
This is because resistance is measured in ohms, and ohms are a measure of how much a component resists the flow of electricity. If there is power connected to the component, the resistance reading will be inaccurate. Therefore, it is important to have the power disconnected from the component when checking resistance.
Resistance is a measure of the opposition to current flow in an electrical circuit.. It is measured in ohms, symbolized by the Greek letter omega (Ω).
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1. Sally rides her bike to school which is 8.0 km from her house. If it takes 15 minutes for her
to reach her destination, what is her average speed in km/hr?
Answers
Which of the following causes liquid water to change into water vapor?
Answers
Answer:
A
Explanation:
Liquid water changes into water vapor because of an increase in the kinetic energy of the particles option (C) is correct.
What is a change of state?A material changing from one physical form to another is known as a change of state.
When heated or cooled, the matter may transform from one state to another. When heated, ice (a solid) turns into water (a liquid).
This process is known as MELTING. When heated, the water turns into steam (a gas).
Thus, liquid water changes into water vapor because of an increase in the kinetic energy of the particles option (C) is correct.
The question is incomplete.
The complete question is:
Which of the following causes liquid water to change into water vapor?
A. a decrease in the motion of the particles
B. a decrease in the randomness of the particles
C. an increase in the kinetic energy of the particles
D. an increase in the attraction between the particles
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An acoustical engineer in designing a music hall is concerned with
A)echoes
B)reverberations
C)reflection
D)all of the above
E)none of the above
Answers
The correct answer is D) all of the above.
An acoustical engineer in designing a music hall is concerned with all of the following factors:
A) Echoes: Echoes refer to the reflections of sound waves that arrive at the listener's ear after bouncing off surfaces. Unwanted echoes can distort the sound and affect the clarity and intelligibility of the music. An acoustical engineer aims to control and minimize echoes in order to create a pleasing and balanced acoustic environment.
B) Reverberations: Reverberation is the persistence of sound in an enclosed space due to multiple reflections. It contributes to the perceived richness and envelopment of sound in a music hall. An acoustical engineer aims to optimize the reverberation time, balancing the decay rate of sound to create a desirable listening experience.
C) Reflection: Reflection refers to the bouncing back of sound waves when they encounter a surface. The way sound reflects off different surfaces in the music hall affects the sound quality, directionality, and spatial characteristics. An acoustical engineer considers the angles and materials of surfaces to control sound reflection and achieve the desired acoustic response.
Therefore, an acoustical engineer takes into account all of these factors (echoes, reverberations, and reflections) when designing a music hall, making the correct answer D) all of the above.
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explain how an earthquake can occur, and briefly describe the forces involved and the effects they have on Earth's crust far from where the earthquake took place. think about how earthquake waves form and travel.
Answers
Answer:
When there is sudden movement on the Earth's crust, earthquakes occur. Earthquakes are caused due to sudden lateral or vertical movements in the crust of the Earth. Or we can say that when tectonic plates ride over the other and cause the collision of orogeny or mountain building.
Explanation:
Red and orange stars are found evenly spread throughout the galactic disk, but blue stars are typically found _________. only in or near star-forming clouds also evenly spread throughout the galactic disk in the halo only in the central bulge
Answers
Red and orange stars are known as cool stars, while blue stars are classified as hot stars. These stars are found in different regions of our galaxy, the Milky Way.
Red and orange stars are relatively common and are found evenly spread throughout the galactic disk. They are typically older stars that have used up most of their hydrogen fuel and are in later stages of their evolution.
On the other hand, blue stars are young and massive, with temperatures ranging from 10,000 to 50,000 Kelvin. These stars emit ultraviolet radiation, which ionizes the gas around them, creating HII regions (regions of ionized hydrogen). Blue stars are usually found in or near star-forming clouds, where they were born.
These clouds are located in the spiral arms of the galaxy, where gas and dust are more concentrated. Therefore, blue stars are not evenly spread throughout the galactic disk but are found in regions where star formation is ongoing.
In summary, red and orange stars are older and found throughout the galactic disk, while blue stars are young and found primarily in or near star-forming regions in the spiral arms of the galaxy.
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consider a planet whose rotation axis is not tilted with respect to its orbital plane. what are the seasons like on this planet?
Answers
As the planet orbits the sun, the angle at which the sunlight hits the planet's surface may change slightly, but this does not result in significant changes in the amount of sunlight that the planet receives.
On a planet whose rotation axis is not tilted with respect to its orbital plane, the seasons are not pronounced. This is because the amount of sunlight that the planet receives does not change significantly throughout the year.
In contrast, on a planet with a tilted rotation axis, the seasons are much more pronounced. As the planet orbits the sun, the angle at which the sunlight hits the planet's surface changes significantly, resulting in longer periods of sunlight in certain parts of the planet and shorter periods of sunlight in other parts. This leads to significant differences in temperature and weather patterns, resulting in the four distinct seasons that we experience on Earth.
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Particles q1 = -20.5 UC, q2 = -9.30 uC, and q3 = -31.6.0 uC are in a line. Particles q, and q2 are separated by 0.980 m and particles q2 and q3 are separated by 0.750 m. What is the net force on particle q2?
Remember: Negative forces (-F) will point Left
Positive forces (+F) will point Right
Answers
The net force on particle q2 can be calculated by finding the net electric force acting on it. The net electric force acting on a particle is the vector sum of the forces exerted by all the other charges on it.
The electric force between two charges q1 and q2 is given by Coulomb's law: F = k * (q1 * q2)/r^2, where k is Coulomb's constant, q1 and q2 are the charges, and r is the distance between them.
The force on particle q2 due to q1 will be:
F1 = k * (q1 * q2) / (0.980m)^2
The force on particle q2 due to q3 will be:
F2 = k * (q2 * q3) / (0.750m)^2
The net force acting on q2 will be the vector sum of F1 and F2.
Keep in mind, q1 and q3 have opposite charges, so they attract each other, while q2 has the same charge as q1, so they repel each other.
Note: The unit of charge is Coulomb (C), but in this problem you are given the charges in microCoulomb (uC) so you need to convert it to Coulomb.
you are using 5 different temperatures for one bacterium in the temperature effects exercise in order to determine the
Answers
You are using 5 different temperature for one bacterium in the temperature effect exercise in an order to determine the Answer is thermal death point
Thermal death point (TDP) of bacteria is basically the study of effect of heat on the growth of bacteria. In simple terms it is the time needed to kill bacteria in a medium of liquid culture at a particular teperature.
So, the basic procedure is Requirements
Sample: Bacterial sample
Others: Nutrient agar plates, Inoculating loops, Incubator
Procedure
Take two nutrient agar plate and divide it into five quadrants. On each quadrant assign time like 0.15sec, 2min, 5min, 15min. This time will depict at particular temperature for how much time the organism was heated. Now take your sample culture that were heated in different temperatures. Under proper aspetic conditions, with the help of an inoculating loop streak the culture on each part of the quadrant. Incubate the plates at 37 degrees centigrade.
Based on the growth of the bacteria the thermal death point can be estimated. The quadrant in which there is no growth is the temperature and the time required to destroy the bacteria.
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Complete Question
You are using 5 different temperatures for one bacterium in the temperature effects exercise in order to determine the 2.
Multiple Choice
a- thermal death point
b- Benaturation time
c- decimal education value
d-othermal death time
Two blocks move along a linear path on a nearly frictionless air track. One block, of mass 0.110 kg, initially moves to the right at a speed of 4.60 m/s, while the second block, of mass 0.220 kg, is initially to the left of the first block and moving to the right at 6.90 m/s. Find the final velocities of the blocks, assuming the collision is elastic.
Answers
Answer:
The final velocities of the blocks are 3.00 m/s and 8.50 m/s, respectively.
The certain region of the electric field is (1) - 5) × 10+5 N is present. Through an area of
(3% - 37) × 10+2cm? the electric flux is
Answers
Simplifying the expression,
Electric flux (Φ) = (1) - 5) × 10+5 N * (3% - 37) × 10^-2 m²
To calculate the electric flux through a given area, we need to multiply the electric field strength by the area and by the cosine of the angle between the electric field and the normal to the area.
Given:
Electric field strength (E) = (1) - 5) × 10+5 N
Area (A) = (3% - 37) × 10+2 cm²
First, we need to convert the given values to the appropriate SI units:
1 cm² = 10^-4 m²
1 N = 1 kg·m/s²
Area (A) = (3% - 37) × 10^-2 m²
Next, we can calculate the electric flux using the formula:
Electric flux (Φ) = E * A * cosθ
Since the angle (θ) between the electric field and the normal to the area is not given, we assume that the electric field is perpendicular to the area, resulting in θ = 0 degrees. In this case, cosθ = 1.
Electric flux (Φ) = (1) - 5) × 10+5 N * (3% - 37) × 10^-2 m² * 1
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(a) A dc power line for a light-rail system carries 1000 A at an angle of 30.0∘ to Earth’s 5.0×10−5T field. What is the force on a 100-m section of this line? (b) Discuss practical concerns this presents, if any.
Answers
A light-rail system's dc power line, which carries 1000 A at an angle of 30.0° to the Earth's 5.0*10^5T field, exerts 2.5N of force on a 100-m portion of this line.
A force in physics is an effect that has the power to alter an object's motion. A force can cause an object with mass to change its velocity, or accelerate (for example, moving from a condition of rest). Intuitively, a push or a pull can also be used to describe force. Being a vector quantity, a force has both magnitude and direction. The SI unit of newton is used to measure it (N). A combination of tram and metro components define the passenger urban rail transit system known as "light rail transit" (LRT).
F = BIlsin(tetha)
F = 5*10^-5*(10^3)(10^2)*sin(pi/6)
F = 5*1/2
F = 2.5N
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a collection of hydrogen atoms in the ground state is illuminated with ultraviolet light of wavelength 75.0 nm. find the kinetic energy of the emitted electrons.
Answers
The kinetic energy of the emitted electrons is 11.24 eV.
What is kinetic energy?The following is the physics definition of kinetic energy:
The amount of effort that a moving object may accomplish is measured by its kinetic energy.
Kinetic energy is a scalar quantity that can only be fully explained by its magnitude.
Given parameters:
Wavelength of ultraviolet light : λ = 75.0 nm.
Energy of the ultraviolet light: E = hc/λ = 1242/75.0 eV= 22.84 eV
Potential energy of a electron of hydrogen atoms in the ground state is -13.6 eV.
This energy of light supplies required potential energy to the emitted electron and kinetic energy of electron.
So, the kinetic energy of the emitted electrons = 22.84 eV - 13.6 eV = 11.24 eV.
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an industrial load consumes 100 kw at 0.8 pf lagging. if an ammeter in the transmission line indicates that the load current is 200 a rms, find the load voltage
Answers
An industrial load consumes 100 kw at 0.8 pf lagging. if an ammeter in the transmission line indicates that the load current is 200 a rms, the load voltage is 625 volts.
We are provided with information about an industrial load, specifically its power consumption, power factor, and current. Our goal is to determine the load voltage. First, we calculate the apparent power (S) using the formula S = P / PF, where P is the power and PF is the power factor. The power is given as 100 kW (kilowatts), and the power factor is stated as 0.8 (lagging). Dividing 100 kW by 0.8 gives us an apparent power of 125 kVA (kilovolt-amperes). Next, we utilize the relationship between apparent power, voltage, and current. The apparent power (S) is given by the formula S = V * I, where V represents voltage and I represents current. Rearranging the formula, we find V = S / I.
Plugging in the values we have, we substitute 125 kVA for S and 200 A (amperes) for I. Dividing 125 kVA by 200 A, we calculate the load voltage to be 625 V (volts). Therefore, based on the given power consumption of 100 kW at a power factor of 0.8 lagging and an ammeter reading of 200 A rms, we conclude that the load voltage is 625 volts.
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The ratio of carbon-14 to nitrogen-14 in an artifact is 1:7. Given that the half-
life of carbon-14 is 5730 years, how old is the artifact?
A. 5730 years
B. 22,920 years
C. 11,460 years
D. 17,190 years
Answers
Answer:
17,190 years old
Explanation:
D
an
electron originally at rest is subjected to an electric field of
magnitude 12KV/m for a distance of 1.5m what is the resulting
kinetic energy of the electron in femto joul
Answers
To calculate the resulting kinetic energy of an electron subjected to an electric field, we need to know the charge of the electron and assume it is accelerated through the electric field.
The charge of an electron is approximately -1.6 x 10^-19 coulombs (C). Given that the electron is at rest initially, its initial kinetic energy is zero.
The electric field is given as 12 kV/m, which can be converted to volts per meter (V/m) by multiplying by 1000. Therefore, the electric field is 12,000 V/m.
The work done on the electron by the electric field is equal to the change in its kinetic energy. The work done can be calculated using the formula:
Work = force * distance
The force experienced by the electron in an electric field is given by Coulomb's law:
Force = charge * electric field
Substituting the values:
Force = (-1.6 x 10^-19 C) * (12,000 V/m)
Now, we can calculate the work done:
Work = (-1.6 x 10^-19 C) * (12,000 V/m) * (1.5 m)
To convert the work done to kinetic energy, we use the fact that work done is equal to the change in kinetic energy:
Work = Change in kinetic energy
Therefore, the resulting kinetic energy of the electron is equal to the calculated work done.
Now, let's perform the calculations:
Work = (-1.6 x 10^-19 C) * (12,000 V/m) * (1.5 m)
= -28.8 x 10^-19 J
Note: The negative sign indicates that the work is done on the electron, which increases its kinetic energy.
To express the kinetic energy in femtojoules (fJ), we need to convert from joules (J) to femtojoules (fJ):
1 J = 10^15 fJ
Therefore, the resulting kinetic energy of the electron is:
Kinetic energy = -28.8 x 10^-19 J = -28.8 x 10^-4 fJ
Please note that the resulting kinetic energy is negative, indicating that work was done on the electron to accelerate it.
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which term describes the process that continually moves water from the ground to the atmosphere and back?
Answers
The word "water cycle" refers to the ongoing process that transfers water from the earth to a atmosphere and back.
Explain the term water cycle?The hydrologic cycle, another name for the water cycle, describes where and how water is kept on Earth.
With in atmosphere, on the surface of the land, and underground, water is kept in reserve. It could be a gas, a liquid, or a solid. Either fresh or salt water can be a liquid (salty).Water flows between its storage locations. It flows on both extremely tiny scales and very big scales (via watersheds, through atmosphere, and beneath the Earth's surface) Water flows both naturally and as a result of human activity. The motion of Earth's water is sustained by the gravity force and solar energy. The water cycle is impacted by human activity because it changes where water is.Thus, the term "water cycle" refers to the ongoing process that transfers water from the earth to a atmosphere and back.
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How does the plastic become positively charged
Answers
Explanation: electrons can be made to move from one object to another.protons do not move because they are tightly bound in the nuclei of atoms so the material that loses electrons becomes positively charged
Lily took 6 hours to complete a journey at an average speed of 58 km/h. For the first 4 hours, she travelled at an average speed of 64 km/h. What was the distance for the rest of the journey?
Answers
Answer:
92km
Explanation:
Given parameters:
Duration of the journey = 6hrs
Average speed = 58km/hr
Now, let us find the total distance of the journey;
Distance = Speed x time
Distance = 58 x 6 = 348km
So;
Average speed for the first 4hrs = 64km/hr
Time = 4hrs
Distance = 64 x 4 = 256km
For the rest of the journey, the student will cover;
= 348km - 256km
= 92km
An object is moving along a straight line. The graph shows the velocity of the object over
time.
What is the instantaneous acceleration of the object at time = 9.5 seconds?
A.-20 m/s2
B.0 m/s2
C.20 m/s2
D.-10 m/s2
Answers
Answer:
From 9 to 10 sec the velocity is decreasing at a constant rate.
Change in V = 20 m/s - 30 m/s = -10 m/s
Since acceleration is constant from point E to point F (straight line)
and t = 9.5 sec is on this line
a = (20 m/s - 30 m/s) / 1 sec = -10 m/s^2
The instantaneous acceleration of the object at time = 9.5 seconds is - 10 m/s².
What is acceleration?Acceleration is the rate at which speed and direction of velocity vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates. Even if the speed is constant, motion on a circle accelerates because the direction is always shifting.
From t = 9 second to t =10 second the velocity of the object decreases at a constant rate.
Change in velocity of the object = final velocity - initial velocity
= 20 m/s - 30 m/s
= -10 m/s
time interval is = 10 sec - 9 sec = 1 sec.
Hence, acceleration of the object is: a = Change in velocity/ time interval
= - 10 m/s/1s
= -10 m/s²
Therefore, the instantaneous acceleration of the object at time = 9.5 seconds is - 10 m/s².
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You need to pick up a book off the floor and place it on a tabletop. You do 1.56J of work to lift the book with a force of 300N. What is the distance?
Answers
Answer:
Distance = 0.0052 m
Explanation:
Work =1.56J
Force = 300N
Distance = ?
Work=Force*Distance
1.56 J = 300N * Distance
1.56/300 = Distance
0.0052 m = Distance
Which of these can be used to induce a current in a closed circuit without the
use of a battery or an electrical power supply?
A) a gravitational field
B) a high temp field
C) a nuclear field
D) a magnetic field
Answers
6. The transfer of thermal energy by radiation does not require matter.
O True
O False
Answers
Answer:false
Explanation:
Glass is an example of a/an _____________.
Answers
Answer:
solid
Explanation:
it's not liquid, nor gas, so solid.
Explanation:
It is not a gas, nor a liquid. Therefore, it is a solid.
You can tell from reading this passage that -
the narrator will definitely find a diamond at the Crater of Diamonds State Park.
diamonds are rare, valuable gems.
garnet is as valuable as a diamond.
semi-precious stones are ugly.
Answers
Answer: B or "diamonds are rare,valuable gems".
Explanation:
since the link does not show very much, I don't know if A is correct or not. D is incorrect because that is an opinion. C is incorrect.
manita carries a box of mass 40kg. What is the wieght of the box?
Answers
Answer:
40kg
Explanation:
that the answer