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.
Correct Answer: Option B
Explanation
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