First Class science · A.15 · Waves and light
Echo
An echo is when sound bounces off a solid surface and comes back later. This makes you hear the same sound again, but after a short delay.
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After Maya claps in the empty gym, they hear a loud bounce. What caused this?
- The floor made a new sound
- A fan created the echo
- Sound bounced off the walls (right)
Why does Ravi hear a sound after making one in a cave?
- The air stopped moving
- The sound bounced off the walls (right)
- A new sound started
In science class, Jonah asks: Why does a person hear their voice again in an empty room?
- The air carried it
- Sound bounced off the walls (right)
- A mirror copied it
Tip: An echo is when sound bounces off a solid surface and comes back later. This makes you hear the same sound again, but after a short delay.
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