First slide

Standing waves

Question

An open pipe of length 33 cm resonates to a frequency of 1000 Hz. The mode of vibration is: (velocity of sound = 330 m/s)

Easy

A

Fundamental
B

The 2nd harmonic
C

The 3rd harmonic
D

The 4th harmonic

Solution

$As \frac{V}{2 l} = \frac{330 \times 100}{2 \times 33} = 500 Hz$
In second harmonic frequency = $\frac{V}{l} = 1000 Hz$ .

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