which wavelengths of starlight ionize the cool hydrogen atoms in the interstellar medium?
Answers
The starlight wavelengths that ionize the cool hydrogen atoms in the interstellar medium are less than 912 angstroms.
The matter in the interstellar space is referred to as the interstellar medium.
It consists of hydrogen gas, helium gas, and plasma in addition to a variety of other elements in smaller quantities.
In the interstellar medium, there is also cosmic dust, which is made up of grains that are rich in heavy elements. Starlight has the ability to ionize cool hydrogen atoms, but only if it is of a specific wavelength.
Wavelengths shorter than 912 angstroms have the ability to ionize hydrogen atoms.
The ionization of hydrogen atoms occurs when a photon of energy greater than the ionization energy of hydrogen, 13.6 eV, is absorbed by a hydrogen atom.
The wavelength corresponding to 13.6 eV is roughly 912 angstroms.
As a result, the ionization of hydrogen atoms requires a photon of energy greater than 13.6 eV, or a wavelength shorter than 912 angstroms.
The wavelengths of the starlight that ionize the cool hydrogen atoms in the interstellar medium are less than 912 angstroms, as a result.
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Related Questions
a force of 1.8 extends a wire by 0.4. what force will extend wire by 1.25cm if the elastic limit is not exceeded.
Answers
Answer:0.27
Explanation:
Cody lives in Florida along the eastern coast. The kind of air mass likely to occur
over his region would be
Choose...
. It would develop here because
Choose...
.
Answers
when you switch off the lights in your room at night, the walls, ceiling, and floor are at a temperature of about 300 k. why are you not dazzled by the radiation that they emit?
Answers
Answer:
Explanation:
Because by Wien's Law, they emit strongest in infrared and human eyes cannot see infrared radiation
what effect does the accelerating voltage have on the radius of the circular trajectory
Answers
The accelerating voltage has a direct effect on the radius of the circular trajectory of a charged particle moving through a magnetic field. As the accelerating voltage increases, the speed of the particle increases, which causes it to move faster along its circular trajectory.
This increase in speed also causes the radius of the circular trajectory to increase, since the force required to keep the particle moving in a circular path becomes stronger. Therefore, increasing the accelerating voltage of a charged particle in a magnetic field results in an increase in the radius of its circular trajectory.
When d=λ/4, the two reflected rays will undergo constructive interference in cases where the path difference between them is an integral multiple of the wavelength (λ). In other words, when the path difference is nλ, where n is an integer (e.g., 0, 1, 2, 3, etc.), constructive interference occurs.
If the two reflected rays are in phase and have a path length difference of an integer multiple of the wavelength, they will undergo constructive interference. In the case where d=λ/4, the two reflected rays will undergo constructive interference if they are reflected from surfaces that are separated by an odd multiple of λ/2, meaning that the path length difference between the two rays is an odd multiple of λ.
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Copper wire has a shape given by a radius that increases as R(x)= aex + b. Its initial radius is .45 mm and final radius is 9.67 mm and its horizontal length is 38 cm. Find its resistance.
Answer should be:
R= 0.55 mΩ
Answers
The resistance of the copper wire, we first need to determine its cross-sectional area.
The cross-sectional area of the wire at a given point x is given by: A(x) = πR(x)²
Finally, we can use the formula for the resistance of a wire: R = ρL / A
Where ρ is the resistivity of copper, which is 1.68 x 10⁻⁸ Ωm, and L is the length of the wire, which is 0.38 m:
R = (1.68 x 10⁻⁸ Ωm)(0.38 m) / 2.353 x 10⁻⁶ m²
R = 0.55 mΩ
Therefore, the resistance of the copper wire is 0.55 mΩ.
The resistance of the copper wire, we'll use the formula for resistance R = ρL/A, where ρ is the resistivity of copper (approximately 1.68 x 10⁻⁸ Ωm), L is the length of the wire, and A is the cross-sectional area of the wire. After calculating the average radius, we can find the cross-sectional area A using the formula A = πr_avg². Then, we can use the formula for resistance R = ρL/A to find the resistance of the wire.
By performing these calculations, we obtain a resistance of: R = 0.55 mΩ
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Number of protons are equal to the number of electrons
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Explanation:
the no of proton of an element is found in the inner part of the orbital of an element along with the neutron ,also knowing that this two add up to give mass no an element
where neutron+proton=mass no=nucleon no,where proton= electron, unless it carries charges call ion
a sample of gas occupies a volume of 71.9 ml . as it expands, it does 133.0 j of work on its surroundings at a constant pressure of 783 torr . what is the final volume of the gas?
Answers
A sample of gas occupies a volume of 71.9 ml . as it expands, it does 133.0 j of work on its surroundings at a constant pressure of 783 torr . The final volume of the gas is approximately 281.9 mL.
To find the final volume of the gas, we can use the formula for work done in a gas expansion:
Work = Pressure * Change in Volume
Given that the work done is 133.0 J, the pressure is 783 torr, and the initial volume is 71.9 mL, we can rearrange the formula to solve for the change in volume:
Change in Volume = Work / Pressure
Converting the pressure to SI units (1 torr = 1/760 atm) and the initial volume to liters (1 mL = 0.001 L), we have:
Change in Volume = 133.0 J / (783 torr * (1/760 atm) * 0.0719 L)
Calculating this, we find:
Change in Volume ≈ 0.210 L
To find the final volume, we add the change in volume to the initial volume:
Final Volume = Initial Volume + Change in Volume
Final Volume ≈ 71.9 mL + 0.210 L
Converting the final volume back to milliliters, we have:
Final Volume ≈ 71.9 mL + 210 mL
Final Volume ≈ 281.9 mL
Therefore, the final volume of the gas is approximately 281.9 mL.
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What is the root cause of earths magnetic field?
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Answer:
I'm not sure but I think it is electric currents in the outer core
An arrow is shot horizontally from the top of a building and it lands 200m from the foot of the building after 10s. assuming air resistance is negligible, calculate the initial velocity of the arrow, find also the height of the building
Answers
The initial velocity and the height of this building are 29 m/s and 780 meters respectively.
How to calculate the initial velocity?In order to calculate the initial velocity, we would apply the second equation of motion:
S = ut - ½at²
200 = u10 - ½(9.8 × 10²)
200 = u10 - 490
u10 = 490 - 200
u10 = 290
u = 290/10
Initial velocity, u = 29 m/s.
Next, we would determine the height of the building:
H = ut + ½at²
H = 29(10) + ½(9.8 × 10²)
H = 290 + 490
Height, H = 780 meters.
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Three two-port circuits, namely Circuit 1 , Circuit 2 , and Circuit 3 , are interconnected in cascade. The input port of Circuit 1 is driven by a 6 A de current source in parallel with an internal resistance of 30Ω. The output port of Circuit 3 drives an adjustable load impedance ZL. The corresponding parameters for Circuit 1, Circuit 2, and Circuit 3, are as follows. Circuit 1: G=[0.167S0.5−0.51.25Ω] Circuit 2: Circuit 3: Y=[200×10−6−800×10−640×10−640×10−6]S Z=[33534000−3100310000]Ω a) Find the a-parameters of the cascaded network. b) Find ZL such that maximum power is transferred from the cascaded network to ZL. c) Evaluate the maximum power that the cascaded two-port network can deliver to ZI.
Answers
a) The A-parameters of the cascaded network are defined by (4 points)Answer:a_11 = 0.149 S^0.5 - 0.0565a_12 = -0.115 S^0.5 - 0.0352a_21 = 136 S^0.5 - 133a_22 = -89.5 S^0.5 + 135b) Find ZL such that maximum power is transferred from the cascaded network to ZL. (2 pointsZ). The maximum power transfer to load impedance ZL occurs when the load is equal to the complex conjugate of the source impedance.
We can calculate the source impedance as follows: Rs = 30 Ω || 1/0.167^2 = 31.2 ΩThe equivalent impedance of circuits 2 and 3 connected in cascade is: Zeq = Z2 + Z3 + Z2 Z3 Y2Z2 + Y3 (Z2 + Z3) + Y2 Y3If we substitute the corresponding values: Zeq = 6.875 - j10.75ΩNow we can determine the value of the load impedance: ZL = Rs* Zeq/(Rs + Zeq)ZL = 17.6 - j8.9Ωc) Evaluate the maximum power that the cascaded two-port network can deliver to ZI. (2 points). The maximum power that can be delivered to the load is half the power available in the source.
We can determine the available power as follows: P = (I_s)^2 * Rs /2P = 558 mW. Now we can calculate the maximum power transferred to the load using the value of ZL:$$P_{load} = \frac{V_{load}^2}{4 Re(Z_L)}$$$$V_{load} = a_{21} I_s Z_2 Z_3$$So,$$P_{load} = \frac{(a_{21} I_s Z_2 Z_3)^2}{4 Re(Z_L)}$$Substitute the corresponding values:$$P_{load} = 203.2 m W $$. Therefore, the maximum power that can be delivered to the load is 203.2 mW.
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Describe the direction in which each object will accelerate. If the object won't accelerate, write "no acceleration." Explain what might be happening to each object in terms of its overall motion.
Answers
Parents and teachers should strive to have children engage in activities within the child's zone of proximal growth, meaning that the activities are:
A. easily accomplished on the first try, so that the child does not become discouraged
B. not so easy that the child can accomplish them right off the bat, nor so difficult that even with help, they cannot be accomplished
C. difficult to accomplish, so that the child always seeks assistance in order to actively engage in social interactions
D. easily accomplished, so that child does not become dependent on adult assistance
Answers
Parents and teachers should strive to have children engage in the activities within child's zone of proximal growth, meaning that the activities are : B.)not so easy that the child accomplish them right off the bat and nor so difficult that even with help, they cannot be accomplished.
What are the activities that parents and teachers should strive to have children engage in?Activities in a child's zone of proximal development are those that parents and teachers should try to get kids involved in. ZPD is the range of activities that are not too easy for the child to accomplish on their own, but also not too difficult that they cannot be accomplished with some guidance or assistance from adults or more capable peers.
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A square metal plate 0.180 m on each side is pivoted about an axis through point O at its center and perpendicular to the plate. (See the figure below (Figure 1) .)
Calculate the net torque about this axis due to the three forces shown in the figure if the magnitudes of the forces are F1 = 17.0 N, F2 = 27.0 N, and F3 = 13.0 N. The plate and all forces are in the plane of the page. (N.m)
the answer 1.73 is incorrect
Answers
The net torque to that axis due to three forces is 2.554 Nm.
How to calculate the net torque?\(F_1\) = forces 1 = 17 N
\(F_2\) = forces 2 = 27 N
\(F_3\) = forces 3 = 13 N
α = side of metal plate = 0.18 m
Net torque can be calculated by multiple the forces by distance. For the question, the \(F_1\) will be negative because the forces of \(F_3\) will move the square metal plate to that side.
Net torque = \(-F_1\frac{a}{2} + F_2\frac{a}{2} + F_3 sin(45)\frac{a}{2} + F_3 cos(45)\frac{a}{2}\)
= \(-17\frac{0.18}{2} + 27\frac{0.18}{2} + 13sin(45)\frac{0.18}{2} + 13 cos(45)\frac{0.18}{2}\)
= -1.53 + 2.43 + 0.827 + 0.827
= 2.554 Nm.
Thus, the net torque for that three forces shown in the figure is 2.554 Nm.
You question is incomplete, but most probably your full question was
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A piston-cylinder device initially contains a mixture of saturated water and saturated steam at 200kPa. The total mass is 0.5 kg and the volume is 0.3 m
∧
3. Now the fluid is heated up under the same pressure, until the volume doubles. Find (a) the initial temperature (b) the final temperature (c) the total internal energy change of the fluid during this process. (d) Also sketch the process on the P-v and I-v diagrams. including the initial state, the final state, and the path.
Answers
(a) The initial temperature is 373.95 K.
(b) The final temperature is 546.15 K.
(c) The total internal energy change of the fluid during this process is 515.4 kJ.
(d) The process can be represented as an isochoric heating process on the P-v diagram and as an isobaric expansion process on the T-v diagram.
(a) To find the initial temperature, we can use the saturated steam tables. At a pressure of 200 kPa, the corresponding saturation temperature is 373.95 K.
(b) Since the volume doubles, the process is an isochoric (constant volume) heating process. Using the ideal gas law, we can determine the final temperature. The initial and final volumes are related by the equation V_final = 2V_initial. Since the mass remains constant, the specific volume (v) is inversely proportional to the density (ρ). Therefore, ρ_final = ρ_initial/2. Using the ideal gas law, we can calculate the final temperature to be 546.15 K.
(c) The total internal energy change can be calculated using the equation ΔU = mC_vΔT, where m is the mass of the fluid and C_v is the specific heat at constant volume. Given the mass as 0.5 kg, the specific heat of water at constant volume, and the temperature change, we can find that the total internal energy change is 515.4 kJ.
(d) On the P-v diagram, the process is represented as a vertical line at 200 kPa, indicating constant pressure. On the T-v diagram, the process is shown as an upward-sloping line, indicating an isobaric expansion process. The initial state is represented as a point on the left, and the final state is represented as a point on the right. The path between the initial and final states is a straight line connecting these two points.
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As a shuttle bus comes to a normal stop, it slows from 9.00 m/s to 0.00 m/s in 5.00 s find the acceleration of the bus.
Answers
Answer:
-1.8 m/s^2
Explanation:
vf-vi/t
0-9=-9
-9/5 = -1.8
-1.8 m/s^2
Ammeters must be connected in _____ with the circuit
A) parrellel
B) series
C) vertical
D) hortizontal
Answers
Ammeters must be connected in series with the circuit in order to accurately measure the current flowing through the circuit. When an ammeter is connected in parallel with a circuit, it creates a low-resistance path, which can alter the current in the circuit and give inaccurate readings.
When an ammeter is connected in series, it becomes a part of the circuit and allows the current to flow through it. This way, the ammeter measures the actual current in the circuit, without altering it.
It is important to note that ammeters should only be connected in series with a circuit that is properly designed and has the necessary safety measures in place. Incorrectly connecting an ammeter can create a hazard and damage the equipment. Therefore, it is important to follow proper procedures and safety guidelines when using ammeters to measure electrical current.
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How many joules is 3 lightning bolts?
Answers
Answer:
one billion to ten billion joules.
Explanation:
To keep a 100-watt light bulb going for one second, one hundred joules of energy will be used.
Answer:
In 3 lightning bolts, there is approximately 1 billion to ten billion joules.
Explanation:
The app claimed it has "Forbidden text"
Answers
A ball is thrown across a field. Its height is given by A(z) ma is the ball's horizontal distance from the thrower's feet.What is the greatest height reached by the ball, and what is the horizontal distance to the thrower's feet at this point? rom what height was the ball thrown? hat is the horizontal distance to the thrower when the ball hits the ground?
Answers
The greatest height reached by the ball is given by A(z) and the horizontal distance to the thrower's feet at this point is denoted as D.
The height from which the ball was thrown is represented as H. The horizontal distance to the thrower when the ball hits the ground is denoted as Dg.
The greatest height reached by the ball is A(z), and the horizontal distance to the thrower's feet at this point is D. The ball was thrown from a height of H.
The horizontal distance to the thrower when the ball hits the ground is Dg.
Determine the horizontal distance?To find the greatest height reached by the ball, we need to analyze the function A(z). The horizontal distance D to the thrower's feet at this point can be determined by considering the horizontal component of the ball's motion.
To calculate the height from which the ball was thrown, we can use the initial condition or other given information.
Finally, to determine the horizontal distance Dg when the ball hits the ground, we need to analyze the ball's trajectory and identify the point at which its height becomes zero.
These calculations involve analyzing the ball's motion in both the horizontal and vertical dimensions, incorporating factors such as initial velocity, angle of projection, and gravitational acceleration.
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HEY can anyone tell me the Atomic Mass of Neon and also what ever the number u get pls round it!!
Answers
Answer:
20.1797 u
Explanation:
Answer:
Hey!
Your answer is that the ATOMIC MASS of Neon is 20.18 to 2 decimal places!
Explanation:
The other way is to round it to the next whole number, which is 20...
You can pick between the two as they are both correctly rounded!
The EXACT number is 20.1797.
I HOPE THIS HELPED YOU! :DSuppose Emma drops an object and the object hits the ground with a speed of 11 m/s. The object is dropped from a height h. Determine the height from which the object should be dropped so that its speed is 22 m/s when it hits the ground.
Answers
the law of conservation of energy, according to which the total energy of a system is conserved. The potential energy and kinetic energy of the object are the forms of energy. Before Emma drops the object, the only energy the object has is its potential energy.
when the object hits the ground, its energy is converted from potential energy to kinetic energy. using the law of conservation of energy, we can solve this problem. The formula to calculate the height of an object is given as; h = (v2 - u2) / 2g Where; h = Height v = Final velocity u = Initial velocity g = Acceleration due to gravity So, the given information is, Initial velocity, u = 0 Final velocity, v = 22 m/s The object is dropped from a height h and hits the ground with a speed of 11 m/s. As the object is dropped, its initial velocity is zero. the velocity of the object at height h is given by; v² = u² + 2gh22² = 0² + 2gh484 = 2ghh = 484 / (2g) .... (1) Again, when the object hits the ground, the velocity of the object is given by the formula; v² = u² + 2gh11² = 0² + 2gh121 = 2ghh = 121 / (2g) ... (2) Equating equations (1) and (2), we get;484 / (2g) = 121 / (2g) Hence, 484 = 121The above equation is not true. the object cannot hit the ground with a speed of 22 m/s when dropped from any height.
it is impossible to determine the height from which the object should be dropped so that its speed is 22 m/s when it hits the ground.
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An example of a poor coping mechanism is ?
Answers
Answer: A bad, maladaptive, unhealthy or destructive coping mechanism is one where the behavior does not resolve the problem in the long-term and may actually increase the harm. Unhealthy coping strategies may feel like they are having the desired effect in the short term.
Explanation: Yes, it was from google...
a bat moving at 2.1 m/s is chasing a flying insect. the bat emits a 57 khz chirp and receives back an echo at 57.38 khz. at what speed is the bat gaining on its prey? take the speed of sound in air to be 338 m/s. answer in units of m/s.
Answers
The bat is gaining on its prey at a speed of 1.183 m/s. The difference between the emitted frequency and the received frequency is known as the Doppler shift, which is related to the relative velocity between the bat and the insect.
The Doppler shift, Δf, is given by the following equation:
Δf/f = v/c
where Δf is the difference between the emitted and received frequencies, f is the emitted frequency, v is the relative velocity, and c is the speed of sound.
Substituting the given values, we get:
Δf/f = v/c
0.0035 = v/338
Solving for v, we get:
v = 0.0035 x 338 = 1.183 m/s
Therefore, the bat is gaining on its prey at a speed of 1.183 m/s.
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a typical circular saw has a radius of 0.184 m and rotates so the velocity of its edge is 110 m/s. how many rpm does the saw make?
Answers
The speed of the saw is 5710 rpm.
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design a base isolation system for an electronic module of mass 5 kg so that only 10% of the displacement of the base is transmitted into the displacement of the module at 50 hz. what will the transmissibility be if the frequency of the base motion changes to 100 hz?
Answers
The base isolation system for the electronic module of mass 5 kg should be designed with a vibration isolator that has a spring constant of k = 0.1 N/m and a damping coefficient b = 0.2 Ns/m. This will result in a transmissibility of 0.1 at 50 Hz.
If the frequency of the base motion changes to 100 Hz, the transmissibility will increase to 0.2.
Base isolation systems are designed to reduce the amount of vibration transmitted through the base of an electronic module. In this case, a base isolation system for a module of mass 5 kg would be designed such that only 10% of the displacement of the base is transmitted into the displacement of the module at 50 Hz.
This would be achieved by using a vibration isolator and a vibration dampener. The vibration isolator would be placed between the base and the module, while the vibration dampener would be used to absorb the kinetic energy of the vibration.
The transmissibility of the base motion would be lower at 100 Hz, meaning that even less of the displacement of the base would be transmitted into the displacement of the module.
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assume the pacific ocean has a surface area of 1.5 x 108 km2 and an average depth of 3700 m. calculate the volume of water in the ocean in liters:
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The bearing of grids of an AB alignment is 100º 22', while the magnetic declination is 8º30' E. What are the true azimuth, magnetic azimuth, and grid azimuth of this alignment?
Answers
The true azimuth of the AB alignment is 91º 52' (east of north), the magnetic azimuth is 100º 22' (east of north), and the grid azimuth is 108º 52' (east of north).
To find the true azimuth, magnetic azimuth, and grid azimuth of the AB alignment, we need to consider the magnetic declination. The magnetic declination indicates the angle between true north and magnetic north at a specific location. In this case, the magnetic declination is 8º 30' E, which means that the magnetic north is 8º 30' east of the true north.
To calculate the true azimuth, we subtract the magnetic declination from the grid azimuth. The grid azimuth is given as 100º 22', so subtracting the magnetic declination of 8º 30' E gives us a true azimuth of 91º 52' (east of north).
The magnetic azimuth remains the same as the grid azimuth, which is 100º 22' (east of north).
The grid azimuth is calculated by adding the magnetic declination to the true azimuth. Since the magnetic declination is east, we add it to the true azimuth. Adding 8º 30' E to the true azimuth of 91º 52' gives us a grid azimuth of 108º 52' (east of north).
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Organizational ________________ culture is a slice of the larger organizational culture that represents the aspects of organizational culture that affect the way employees think and act in ethics-related situations.
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Organizational __ ethical culture__ culture is a slice of the larger organizational culture that represents the aspects of organizational culture that affect the way employees think and act in ethics-related situations.
Organisational ethical culture is a subset of organisational culture that influences employee ethics-related behaviour.
Organisational culture is shaped by common values, beliefs, norms, and behaviours. Ethical culture is the subset of organisational culture that governs employees' ethical behaviour and decisions.
Ethical culture affects how employees view ethical challenges, how important ethical behaviour is, and how ethically conscious and accountable the organisation is. It establishes employee ethical standards.
Policies, standards of conduct, leadership, communication, and ethical training reflect the organization's ethical culture. It guides ethical decision-making and how personnel should handle ethical issues.
Organisations encourage integrity, responsibility, and ethical behaviour by fostering a strong ethical culture. It supports trust, ethical awareness, and ethical compliance.
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Mention three ways to increase the accuracy in your measurement
Answers
Answer:
1) Use multiple instruments to measure
2) Take several measurements
3) Control the other variables delicately
4) Be meticulous when measuring
if we could capture the spectrum of an exoplanet, we may find evidence for life on that planet in the form of ....
Answers
If we could capture the spectrum of an exoplanet, we may find evidence for life on that planet in the form of specific chemical signatures, such as the presence of oxygen, methane, or other gases that are typically associated with biological processes.
These gases would be considered strong indicators of the presence of life on the exoplanet, and their detection would be a major breakthrough in the search for extraterrestrial life. However, it is important to note that other factors, such as non-biological processes, could also produce these same chemical signatures, so further investigation would be necessary to confirm the presence of life.
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