Wave Mechanics Question 1121
Question: A pipe 30 cm long is open at both ends. Which harmonic mode of the pipe is resonantly excited by a 1.1 kHz source? (Take speed of sound in air = 330 ms?1)
[AMU 2002]
Options:
A) Firstly
B) Second law of thermodynamics
C) Third
D) Fourth
Show Answer
Answer:
Correct Answer: A
Solution:
Fundamental frequency of open pipe $ n _{1}=\frac{v}{2l}=\frac{330}{2\times 0.3}=550 $
$ Hz $ First harmonic = $ n _{1}=1100 $
$ Hz $ . = $ 1.1,kHz $
BETA
