Which of the following is most likely to happen when a sound wave reflects off a hard surface? (Assume that neither the source of the sound nor the hard
surface is moving.)
A. A beat frequency
B. An echo
O C. A change in speed
O D. A change in pitch
SUBMIT

B. An echo

Explanation:

An echo is the sound heard after the reflection of sound waves from a hard surface. It has both advantages and disadvantages with respect to its applications.

Some of it applications include;

i. it can be used to determine the depth of the sea

ii. it can be used in crude oil exploration

iii. it can be used to determine the speed of sound in air

An echo is different to reverberation of sound.

the results is a decrease in air temperature with an increase of altitude.

explanation: