PLEASE HELP AND I WILL GIVE BRAINLIEST

Physics

2 answers:

san4es73 [151]3 years ago

3 0

Answer:

A: Sound waves produce an echo

Explanation:

because the cup is a hard smooth surface you can hear the voice

Veseljchak [2.6K]3 years ago

3 0

Answer:

Answer is D

Explanation:

The sound travels along the string as a longitudinal wave and ultimately vibrates the bottom of the receiving cup. The cup transmits the sound into the air around the listener's ear, allowing her to hear the speaker.

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