6.2 Interference of sound

• Physics
• Secondary Education
• Age 12,13

27 March 2023

Unit 6.3 Interference of sound

Content objectives

• describe how sound waves reinforce
• state what happens to a sound when sound waves reinforce
• explain how sound waves cancel
• describe what happens to the loudness of a sound when sound waves cancel

• shape of the graph of a sound

From memory:

peak

trough

• Answer the given questions related to interference.
• Discuss by comparing with the person next to you your answers. 

Prior Knowledge Check

Which is the synonym for the word "interfere"?

prevent

allow

decrease

increase

Sound waves produce interference when they meet each other.

1. True
2. False

Interference can happen if the waves are of the same type.

I agree.

I disagree.

Sound waves CAN interfere with water waves.

I agree.

I disagree.

What happens when two sound waves of the same frequency and amplitude interfere with each other?

Key Question 1

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Interference can produce TWO effects: the waves can reinforce or the waves can cancel each other.

I agree.

I disagree.

When two sound waves, the amplitude of the sound waves increases. 

Does the sound become louder?

1. Yes
2. No
3. Maybe

When two sound waves, the amplitude of the sound waves increases. 

Does the pitch become higher?

1. Yes
2. No
3. Maybe

When two sound waves, the amplitude of the sound waves increases. 

Does the frequency become increase?

1. Yes
2. No
3. Maybe

Application 

Application 

27 March 2023

Unit 6.3 Interference of sound

Would you hear a sound when the peaks and troughs of two similar sound waves meet together?

Key Question 2

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What two conditions must two waves have to interfere effectively with each other?

Application 

Plenary (Sharing)

•  Answer questions found on page 221 of your learner's book.
• Use your science notebook for your answers.
• Turn your work in by the end of the period.

Activity

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