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# Sound Absorption | Science Experiment

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Contents

## Introduction

Are you tired of the noise? If yes, in this article, we will do an experiment to study which are the best surfaces for sound absorption.

## Basic Building Concept

1. We have studied that the shapes which are triangular and rectangular absorb most of the sound.

2. And the surfaces which are peaked are the least absorbent.

3. The absorption of sound is a process in which sound energy decreases on moving from the source to the absorbent material such as walls, sheets, ceilings, etc.

## Aim

To find out the best surfaces for sound absorption.

## Requirements

1. Insulative styrofoam,

2. A Tuner,

3. A microphone,

4. A towel,

5. A computer,

6. A program Cool Edit Pro# installed on the computer

## Procedure

Step 1: With the help of your parents, cut the insulative styrofoam.

Step 2: Test this experiment by lining all four sides of the box.

Step 3: On one side of the box, place a tuner.

Step 4: On the other side of the box, place a microphone.

Step 5: Put a tower over the top of the box.

Step 6: Connect the microphone with the computer in which the program Cool Edit Pro# is running.

Step 7: After testing each type of surface, switch to the next.

COOL EDIT PRO PROGRAM

## Observation

We have found that

1. The triangular and rectangular surfaces absorb sound at a high rate, only at only 80 decibels.

2. The peaked, semi-circular, and flat surfaces are the least absorbent.

## Result

Triangular and rectangular surfaces absorb most of the sound before reflecting it, while peaked surfaces absorb the least sound.

## Precautions

1. Place each instrument carefully.

2. Make sure the program is running properly on the computer.

3. Take help from your parents for cutting insulation styrofoam.

## Conclusion

In this way, we have seen which surfaces have a higher tendency for sound absorption. We have also concluded that those surfaces which are higher absorbent can be helpful in controlling sound pollution near noisy areas.

## Viva Question With Answers

Q.1 What was the aim of your experiment?

ANS. To find out the best surfaces for sound absorption.

Q.2 Which kind of surface has a high sound-absorbent property?

ANS. Triangular and rectangular.

Q.3 Which kind of surface has less sound absorbent property?

ANS. Peaked, semi-circular, and flat surfaces.

Q.4 How can the high absorbent property of rectangular and triangular surfaces help us?

ANS. These surfaces will help us to reduce sound pollution in noisy areas.

Q.5 What do you know about insulative styrofoam?

ANS. It is mostly made up of air and is insulative of heat in nature.

Q.6 What do you know about absorption of sound?

ANS. This term is defined as the loss in sound energy on moving from the source to the absorbent material such as walls, sheets, ceilings, etc.

Q.7 Why do you use Cool Edit Pro# in this experiment?

ANS. This software is used for measuring absorbed sound.

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