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Q.

Water waves in the sea are observed to have a wavelength of 300 m and a frequency of 0.07 Hz. What will be the speed of these waves?


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a

10 m/sec

b

15 m/sec

c

21 m/sec

d

22 m/sec 

answer is C.

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Detailed Solution

Water waves in the sea are observed to have a wavelength of 300 m and a frequency of 0.07 Hz. The speed of these waves will be 21 m/sec.
According to the question, the waves have a wavelength = 300 m
The frequency given is (f) = 0.07 Hz.
From the relation between frequency, wavelength and wave velocity is v=f× λ
Thus, velocity (v) = 0.07 × 300 
⇒velocity (v) = 21 m/sec.
 
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