First slide

Stationary waves

Question

In one metre long open pipe what is the harmonic of resonance obtained with a tuning fork of frequency 480 Hz

Moderate

A

First
B

Second
C

Third
D

Fourth

Solution

In case of open pipe, $n = \frac{Nv}{2 l}$ where N = order of harmonics = order of mode of vibration
$\Rightarrow N = \frac{n \times 2 l}{v}$
$= \frac{480}{330} \times 2 \times 1 = 3$ (Here v = 330 m/s)

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