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Chapter 10

Revise Sound

QuestionAnswer
What is sound? Sound is a from of energy that we can hear. It is the vibration of air that we hear.
How does sound travel? In waves, spreading out over the distance they travel.
What is an echo and how are they produced? An echo is a reflected sound. They are produced by the original sound hitting something like a wall and the sound waves returning to you.
Which is faster the speed of sound or the speed of light? Speed of light.
How do we hear sound? The vibration in the air move a diaphragm in our ear which in turn vibrates bones in our ear (hammer, anvil, stirrup) to product sound we hear.
What is sound measured in? Decibels (dB).
Why should we wear ear protection if listening to sounds about 70dB? Sounds over 70dB can damage our ears and reduce the ability to hear clearly later in life.
Explain why you see light and then hear sound as in thunder and lightning or at a fireworks display. light travels far faster than sound (light ~300,000m/s, sound ~340m/s) so you see the light before you hear the sound.
Created by: SC Dave
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