Question

A boat at anchor is rocked by waves whose crests are 100 m apart and whose speed is 25 m/s. After what interval these waves reach the boat?(ans: 4s)

Answer 1

Answer:

Distance between crests=Wavelength of the wave

Wavelength of the wave(l)=100m

Speed of the waves(v)=25m/s

$Time \: interval \: at \: which \: waves \: reach \: the \: boat= \: \frac{l}{v}$

Time interval=100/25 s=4s

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