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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 2011Electromagnetic Waves

Solution:

In the fundamental mode,
Frequency, $ n = \frac{v}{\lambda}$
$ n = \frac{v}{4l}$
$ n = \frac{l}{t \times4l} \bigg[\because v = \frac{l}{t}\bigg]$
$ n = \frac{1}{0.01 \times4}$
$ n = 25 $