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2 cards from this section. Quick, good the night before a test.
What is an echo?
Think about the sound bouncing off a wall.
Why is a hard surface better for creating an echo?
Consider what happens when you speak to a wall versus a pillow.
What is required for a sound to become an echo?
Think of the difference between talking to a wall or a pillow.
True or False: Sound always travels faster than light.
Consider how long it takes to hear thunder after a lightning flash.
A shout is made towards a cliff. The echo is heard after 4 seconds. Calculate the distance to the cliff.
Consider the echo's trip there and back.
Explain how sound quality changes in an auditorium versus an empty room regarding echoes and reverberation.
Think about how sound behaves in enclosed spaces.
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