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  4. In the fundamental mode, time taken by the wave to reach the closed end of the air filled pipe is 0.01 s . The fundamental frequency is

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Q. In the fundamental mode, time taken by the wave to reach the closed end of the air filled pipe is $ 0.01\, s $ . The fundamental frequency is

MHT CETMHT CET 2010

Solution:

In the fundamental mode,
Frequency, $n=\frac{v}{\lambda}$
$n =\frac{v}{4 l} $
$n =\frac{l}{t \times 4 l} \,\,\,\left[\because v=\frac{l}{t}\right] $
$n =\frac{1}{0.01 \times 4} $
$n =25$