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Mini-Quiz: Sound Echoes

by Ron Kurtus

Take this Mini-Quiz to check your understanding of the lesson material.

1. If sound travels at 1000 feet/second, why does it take 2 seconds to hear the echo of a wall 1000 feet away?

Echoes travel at 1/2 the speed of sound

It takes sound 1 second to get there and 1 second to get back

It only takes 1 second to hear the echo

2. How is the Doppler Effect used to measure the velocity of an object?

The frequency of the sound changes with distance from the object

The frequency of the sound changes with the velocity of the object

The velocity of the object changes with the frequency of the sound

3. How do bats find moths at night?

They have very keen vision

They listen for chirps from the moths

They process echoes from the moths

If you got all three correct, you are on your way to becoming a Champion in Physics. If you had problems, you had better look over the material again.

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