Question

The second overtone of an open pipe is in resonance with the first overtone of a closed pipe of length 2m. Length of the open pipe is –

• A. 4 m
• B. 2 m
• C. 8 m
• D. 1 m

Answer 1

Answer: (C)

8 m

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…….