In a sinusoidal wave, the time required for a particular point to move from maximum displacement to zero displacement is $0.170\,$second. The frequency of the wave is .... $Hz$
AIIMS 2001,AIPMT 1998, Medium
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(a) Time required for a point to move from maximum displacement to zero displacement is

$t = \frac{T}{4} = \frac{1}{{4n}}$
==> $n = \frac{1}{{4t}} = \frac{1}{{4 \times 0.170}} = 1.47\,Hz$

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