How many hours will it take for only 1.5625 mg to remain

Answers

Answer 1

Answer:

36 hours

Explanation:

Notice that you are given the actual table of how the isotope reduces , and it shows that for each period of 6 hours the isotope decays to half of the initial number.

EVery 6 hours, the reduction in number of mg of the isotope goes down in half'

100 mg, then 50 mg, then 25 mg, then 12.5 mg, then 6.25 mg, then 3.125 mg and finally (reaching 1.5625 mg

That was 6 periods of 6 hours each, which totals: 6 time 6 hours = 36 hours

Related Questions

To make a 450g solution with a mass by mass concentration of 7%, how much salt and water do you need to mix?

Answers

Answer:salt: 31. 5g

water: 418. 5g

Explanation

Answer:

salt: 31. 5g

water: 418. 5g

Explanation:

Which of these statements best describes which traits are expressed by an organism? A. An organism expresses all the traits for which it carries genes.
B. An organism expresses only the traits whose genes are inherited from a parent.
C. An organism expresses only the traits whose genes it will pass on to its offspring.
D. An organism expresses some traits for which it carries genes while others are dominant

Answers

The statement that best describes which traits are expressed by an organism is A.

An organism expresses all the traits for which it carries genes. This is because an organism's traits are determined by the combination of genes it carries, which includes both dominant and recessive genes. Even if a trait is not expressed in an organism, it can still be carried in its genes and passed on to its offspring. Therefore, all the traits for which an organism carries genes have the potential to be expressed in either the organism or its offspring.

B-An organism expresses only the traits whose genes are inherited from a parent.

Please draw a diagram of how a magnetic field works around a magnet. Please label.

Answers

This is the best picture I can find

Mark me Brainly

Please draw a diagram of how a magnetic field works around a magnet. Please label.

PLS HELP DONT GOGGLE!!

Answers

The area where the land meets the sea is called the coastline. This area can have different physical features depending on its location. Some common features of coastlines are beaches, cliffs, bays, harbors, estuaries, and dunes. Beaches are made up of loose particles like sand and gravel that are deposited by the sea.

At the point where land meets the sea, there is often a distinct line of demarcation between the two. This line, known as the shoreline, can take many different forms, depending on the specific geographic location.

In some areas, the shoreline may consist of a wide, sandy beach, while in others it may be rocky and steep.

In general, the shoreline is where the land transitions to the sea, and it is often marked by the presence of waves, tides, and other oceanic phenomena.

1. Using D10W and a vial of NaCl 4 mEq/mL, how many mL of NaCl are needed to prepare 250 mL of a
D10/NS solution?
a. 4.8mL
b. 9.6ml
c. 19.6mL
d. 154mL

Answers

To prepare 250 mL of a D10/NS solution using D10W and a vial of NaCl 4 mEq/mL, you would need 9.6 mL of NaCl. Normal saline (NS) contains 154 mEq/L of sodium chloride (NaCl). To prepare 250 mL of NS, you would need 250 mL * (154 mEq/L) = 38500 mEq of NaCl. Since the vial of NaCl contains 4 mEq/mL, you would need 38500 mEq / (4 mEq/mL) = 9625 mL = 9.6 mL of NaCl. So the correct answer is b. 9.6ml.

the correct answer is A 4.8 mL

Each type of element has their own special spectrum that is unique when compared to the spectra of other atoms.

True

False

Answers

Answer:

TRUE

Explanation:

Answer:

true do you need an explanation

1. In these two pictures, the arrows represent forces acting. Write the names of the forces in the boxes
2. Draw and label your own arrows on these two pictures to show the forces acting.
(See the image attached)
Please help!!! It will be greatly appreciated

Answers

thew one with the plane the arrow is going slightly down and the one with the ball has two arrows one for the ball and foot both going same way

Can somebody help me with my science HW

Answers

1.C 2. A 3. A 4. B 5. B 6. C

1. D
2. C
3. C
4. B
5. C

Can you help me please

Answers

Answer:

Explanation:

DDDDD

When we rewrite the given in a simpler unit we have 7.9 ms-1.

What is dimensional analysis of formulas?

By looking at the units of the quantities involved, dimensional analysis is a technique for determining whether a physical equation or formula is right. The essential tenet of dimensional analysis is that the quantities being multiplied or divided in the equation must have units that are equal to the units of the final result.

We know that we have to apply the principles that apply to dimensional analysis in the question and we have that;

m^2.s/m.s^2

= ms-1

Learn more about dimensions:https://brainly.com/question/20344091

#SPJ1

Scientists approximate that there are 20 billion stars like our sun in the Milky Way.
Why does the sun appear to be brighter than any other star in the Milky Way?
A.the sun is older than all of the other stars in the Milky Way
B.the sun is closer to the earth than any other star in the Milky Way
C.the sun is hotter than any other star in the Milky Way
D.the sun has more energy than any other star in the Milky Way

Answers

Answer: B.) the sun is closer to the Earth

Answer:

Explanation:

the sun is really hot so that is why

and please answer the questions on my profile please i beg of you its due by 11:59 pm TONIGHT or i get kicked out of school.. pls help..

The image is a model of sulfuric acid that has a chemical formula of H2SO4. In 1-2 sentences, explain why creating models, like the one shown in the image above, is important in understanding substances.

(2 points)

Answers

It’s important to be able to visualize or make a visual representation of a chemical formula.it shows you the 2 hydrogen atoms and the 4 oxygen atoms connected to the one sulfur.using the model you can see the balance of the equation without physically making the substance.

Answer: Creating models is important for a better understanding of the chemical composition of the substances.

Explanation:

The three models of the substances are useful in understanding the molecular composition of the substance and the arrangement of the elements. Even chemical reactions can be explained and understood using these models.

When the speed of the bottle is 2 m/s, the KE is kg m2/s2. When the speed of the bottle is 3 m/s, the KE is kg m2/s2. When the speed of the bottle is 4 m/s, the KE is kg m2/s2. When the speed of the bottle is 5 m/s, the KE is kg m2/s2. When the speed of the bottle is 6 m/s, the KE is kg m2/s2.
instructions
In this part of the experiment, you will be changing the speed of the bottle by dropping it from different heights. You will use the same mass, 0.250 kg, for each trial, so record this mass in Table B for each velocity. Then, calculate the expected kinetic energy (KE) at each velocity. Use the formula KE = mv2,
where m is the mass and v is the speed. Record your calculations in Table B of your Student Guide.

Answers

Answer:

Based on the given instructions, you need to calculate the expected kinetic energy (KE) at each velocity using the formula KE = mv^2, where m is the mass and v is the speed. The mass is given as 0.250 kg.

Table B: Calculation of Kinetic Energy (KE)

Speed (m/s)Mass (kg)KE (kg m^2/s^2)20.2500.50030.2500.75040.2501.00050.2501.25060.2501.500

To calculate the kinetic energy at each velocity, multiply the mass (0.250 kg) by the square of the velocity.

For example, when the speed of the bottle is 2 m/s: KE = (0.250 kg) * (2 m/s)^2 = 0.250 kg * 4 m^2/s^2 = 1.000 kg m^2/s^2

Perform similar calculations for the other velocities and record the results in Table B.

Answer:

Explanation:mass of the bottle in each case is M = 0.250 kg

now as per given speeds we can use the formula of kinetic energy to find it

1) when speed is 2 m/s