Question

Velocity of sound in air is 320 ms^–1. The pipe is shown in figure cannot vibrate with a sound of frequency –

• A. 80 Hz
• B. 240 Hz
• C. 320 Hz
• D. 400 Hz

Answer 1

Answer: (C)

320 Hz

Answer 2

Fundamental frequency n =$\frac{v}{4L}$= $\frac{320}{4 \times 1}$ = 80 Hz

frequency which can produces from this pipe

is = n, 3n, 5n, 7n ……..

= 80, 240, 400 Hz…….