A sound note of frequency 250 Hz and wavelength 1.3m is produced at a point near a hill. If the echo of the sound is received 1 second later at the point, how far away is the hill from the point?

A sound note of frequency 250 Hz and wavelength 1.3m is produced at a point near a hill. If the echo of the sound is received 1 second later at the point, how far away is the hill from the point?

A 131.3m
B 162.5m
C 248.7m
D 251.3m
E 325.0m.

waec 1995 physics

The correct answer is B. 162.5m

No explanation given

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