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Chapter 10
Revise Sound
| Question | Answer |
|---|---|
| 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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