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  4. In a sinusoidal wave, the time required for a particular point to move from maximum displacement to zero displacement is 0.14 s. The frequency of the wave is

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Q. In a sinusoidal wave, the time required for a particular point to move from maximum displacement to zero displacement is $0.14\, s$. The frequency of the wave is

KEAMKEAM 2009Waves

Solution:

Time Taken by the wave to travel a distance equal to one wavelength
$ =0.14\times 4 $
$ =0.56s $
Frequency $ {{f}_{c}}=\frac{I}{T} $
$ =\frac{1}{0.56} $
$ f=\frac{100}{56} $
Or $ f=1.79\,Hz $