© Aristo Educational Press Ltd. 2018 47 Background knowledge of soundproofing: The basic principle of soundproofing is using suitable materials to absorb or reflect background noise from the environment. In general, soft, flexible, or porous materials are good sound absorbers. For example, Fig. 1 shows an acoustic foam which has these properties. It is commonly used for soundproofing in studios and industrial facilities. On the other hand, dense and hard materials such as concrete are good sound reflectors. For example, some noise barriers on a road are made of concrete as shown in Fig. 2. Fig. 2 Fig. 1 STEM connection 10.1 Designing and making soundproof earphones S t u d e n t ’ s W o r k s h e e t s S t u d e n t ’ s W o r k s h e e t s Task: Make soundproof earphones to block out background noise so that you can listen to music with the earphones in a noisy place

STEM connection 10 - Aristo · For example, some noise barriers on a road are made of concrete as shown in Fig. 2. Fig. 2 Fig. 1 STEM connection 10.1 Designing and making soundproof

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Page 1: STEM connection 10 - Aristo · For example, some noise barriers on a road are made of concrete as shown in Fig. 2. Fig. 2 Fig. 1 STEM connection 10.1 Designing and making soundproof

Background knowledge of soundproofing:

The basic principle of soundproofing is using suitable materials to absorb or reflect background noise from the environment.

In general, soft, flexible, or porous materials are good sound absorbers. For example, Fig. 1 shows an acoustic foam which has these properties. It is commonly used for soundproofing in studios and industrial facilities.

On the other hand, dense and hard materials such as concrete are good sound reflectors. For example, some noise barriers on a road are made of concrete as shown in Fig. 2.

Fig. 2

Fig. 1

STEM connection 10.1Designing and making soundproof earphones

Student’s WorksheetsStudent’s Worksheets

Task: Make soundproof earphones to block out background noise so that you can listen to music with the earphones in a noisy place

Page 2: STEM connection 10 - Aristo · For example, some noise barriers on a road are made of concrete as shown in Fig. 2. Fig. 2 Fig. 1 STEM connection 10.1 Designing and making soundproof

Part A—Identify the problems1. Suppose you are an engineer to design and make earphones. Why should it be better

to make the earphones more soundproof to background noise?

Part B—Do research1. Search some information about the principle of soundproofing and write it down

briefly.

2. Which kinds of materials are commonly used in daily life to block out noise? Are there any common properties of these materials?

Part C—Design the fair test1. Search information on the Internet and design a fair test to test the soundproofing

ability of different materials.

2. Briefly describe how you will perform the fair test and identify different variables of the test. You may also draw a labelled diagram to show your set-up.

Your teacher will divide the class into groups and give each group simple earphones. Collaborate with your group members to design a fair test to find out which material can be used to block out background noise. Then try to make soundproof earphones using the material.

Page 3: STEM connection 10 - Aristo · For example, some noise barriers on a road are made of concrete as shown in Fig. 2. Fig. 2 Fig. 1 STEM connection 10.1 Designing and making soundproof

©AristoEducationalPressLtd.201849

Part D—Design soundproof earphones1. Think about different methods of making the earphones more soundproof to

background noise. You can search the Internet for some existing design of ear protectors in different industries (such as the ones for construction workers, or airport workers who work near runways).

2. Draw your design below. Label all the parts. Also, briefly describe how you will make the soundproof earphones.