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# Sound Decay in Different Gases | Science Experiment

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## Introduction

In this experiment, we will be testing sound decay in different gases; we will be dealing with the aspects of sound decay. And would check if it varies with the density of the atmosphere in which it is being tested.

We will see the consistent half-life of the sound of each trial conducted in the same environment and the varying half-life in every different test, either ascending or descending consecutively.

## Aim

To check whether or not sound decay varies with atmosphere density in which it is being tested.

## Theory

1. Sound decay is how sound comes to an end.

2. The nature of sound decay varies on the basis of time dilation and amplitude.

## Requirements

1. Bell jar dome

2. Tuning fork,

3. A stand,

4. Microphone,

5. Computer,

6. Carbon dioxide gas,

7. Helium gas,

8. Air ( composed mainly of oxygen and nitrogen).

## Procedure

Step 1: For our experiment on sound decay, take a 127 Hertz tuning fork and place it inside a bell jar dome.

Step 2: Suspend the tuning fork from a stand on the inside.

Step 3: Tilt the bell jar dome so that the tuning fork will swing and hit the bell jar lid.

Step 4: Attach the microphone to the computer.

Step 5: Record the resulting sound using seconds and volts for the unit with this attached microphone.

Step 6: Analyze the resulting sound.

Step 7: Now, determine the half-life of sound.

Step 8: Use all three glasses with different pressures.

Step 9: Test each gas at 10, 20, and 30 inches of mercury.

Step 10: Test an additional trial in a vacuum also.

## Observation

1. In our experiment, we observed that our result was not ascending or descending consecutively.

2. We saw that the sound decay varies with the density of the gas it is transmitted through, but it is not the only factor affecting the half-life of sound.

3. The involved gasses have ideal pressure in themselves.

## Result

The result of this experiment are;

1. At 30 inches of mercury, the half-life of sound when tested in the air is, 3.85 seconds.

2. At 20 inches of mercury, the half-life of sound when tested in the air is, 7.15 seconds.

3. At 10 inches of mercury, the half-life of sound when tested in the air is, 5.7 seconds.

4. At 30 inches of mercury, the half-life of sound when tested in carbon dioxide, is 1.2 seconds.

5. At 20 inches of mercury, the half-life of sound when tested in carbon dioxide, is 0.75 seconds.

6. At 10 inches of mercury, the half-life of sound when tested in carbon dioxide, is 0.9 seconds.

## Conclusion

In this experiment, we have tested the decay of sound emitted from the tuning fork to test the relation between the density of the gas in which it is being tested and the sound decay.

Q.1 What was the aim of your experiment?

ANS. To check whether or not sound decay varies with atmosphere density in which it is being tested.

Q.2 What do you understand about sound decay?

ANS. Sound decay is how based on sound comes to an end.

Q.3 What is the result of your experiment?

ANS. We saw that the sound decay varies with the density of the gas it is transmitted through, but it is not the only factor affecting the half-life of sound.

Q.4 What is the half-life of sound when tested in air at 30 inches of mercury?

ANS. 3.85 seconds.

Q.5 What is the half-life of sound when tested in carbon dioxide at 30 inches of mercury?

ANS. 1.2 seconds.

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