Question

Length of an organ pipe open at both ends is 34 cm. If velocity of sound is 340 m is, then the frequency of 2^nd overtone is ______.

Options

• 1000 Hz

• 2000 Hz

• 2400 Hz

• 1500 Hz

Answer 1

Length of an organ pipe open at both ends is 34 cm. If velocity of sound is 340 m is, then the frequency of 2^nd overtone is 1500 Hz.

Explanation:

l = 34 cm   v = 340 m/s

`"n"_0 = "v"/(2l)     3"n"_0 = (3"V")/(2l)`

2^nd overtone = 3^rd harmonic

∵ 1^st harmonic `"n"_0 = "v"/(2l)`

`3"n"_0 = (3"V")/(2l) = (3 xx 340 xx 100)/(2 xx 34) = 1.5 xx 1000 = 1500`