You count 17 complete waves pass a certain point in 120 s and you measure 5.50 m
from a crest to a trough on the passing waves. What is the velocity of these waves?
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Answer:
No. Of waves-17
Total time in passing waves-120s
Distance from one crest to trough is 5.50 m
Therefore, wavelength is 2×5.50m=11.0m
Total distance covered by waves=no. of waves × wavelength
=17 × 11 = 187m
Velocity of waves= distance/time= 187/120=1.55m/s.
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