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Question 104
H

A sound pulse with frequency 40 kHz40\ \mathrm{kHz}40 kHz and wavelength 8.5 mm returns from a wall after 25 ms. What is the distance between the source and the wall?

[1]
A

0.425 m0.425\ \mathrm{m}0.425 m

B

2.125 m2.125\ \mathrm{m}2.125 m

C

4.25 m4.25\ \mathrm{m}4.25 m

D

8.50 m8.50\ \mathrm{m}8.50 m

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