First slide

Stationary waves

Question

Find the fundamental frequency of a closed pipe, if the length of the air column is 42 m. (speed of sound in air = 332 m/sec)

Easy

A

2 Hz
B

4 Hz
C

7 Hz
D

9 Hz

Solution

For closed pipe $n = \frac{v}{4 l} \Rightarrow n = \frac{332}{4 \times 42} = 2 Hz$ .

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