A resonance pipe is open at both ends and 30 cm of its length is in resonance with an external frequency 1.1 kHz . If the speed of sound is 330 m/s , which harmonic is in resonance ?

Question

A resonance pipe is open at both ends and 30 cm of its length is in resonance with an external frequency 1.1 kHz . If the speed of sound is 330 m/s , which harmonic is in resonance ? (A) First (B) Second (C) Third (D) Fourth

Tardigrade Admin · Accepted Answer

Fundamental frequency of open pipe First harmonic =n1=(V/2l)=(330/2× 0.3)=550 Hz Second harmonic =2 × n1=1100 Hz =1.1 kHz

Q. A resonance pipe is open at both ends and $30 c m$ of its length is in resonance with an external frequency $1.1 k Hz$ . If the speed of sound is $330 m / s$ , which harmonic is in resonance ?

First

Second

Third

Fourth

Fundamental frequency of open pipe
First harmonic $= n_{1} = \frac{V}{2 l} = \frac{330}{2 \times 0.3} = 550 Hz$
Second harmonic $= 2 \times n_{1} = 1100 Hz$
$= 1.1 k Hz$

Q. A resonance pipe is open at both ends and 30cm of its length is in resonance with an external frequency 1.1kHz . If the speed of sound is 330m/s , which harmonic is in resonance ?