First slide

Stationary waves

Question

What is minimum length of a tube, open at both ends, that resonates with tuning fork of frequency 350 Hz ? [velocity of sound in air = 350 m/s]

Easy

A

50 cm
B

100 cm
C

75 cm
D

25 cm

Solution

Fundamental frequency $n = \frac{v}{2 l}$
$\Rightarrow 350 = \frac{350}{2 L} \Rightarrow L = \frac{1}{2} m = 50 cm .$

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