First slide

Stationary waves

Question

A resonance air column of length 20 cm resonates with a tuning fork of frequency 250 Hz. The speed of sound in air is

Easy

A

300 m/s
B

200 m/s
C

150 m/s
D

75 m/s

Solution

For closed pipe $n_{1} = \frac{v}{4 l} \Rightarrow 250 = \frac{v}{4 \times 0 .2} \Rightarrow v = 200 m / s$

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