Wave Motion 2 Question 35

35. An air column in a pipe, which is closed at one end, will be in resonance with a vibrating tuning fork of frequency 264Hz, if the length of the column in cm is (Speed of sound in air =330m/s )

(1985,2M)

(a) 31.25

(b) 62.50

(c) 93.75

(d) 125

Fill in the Blanks

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Answer:

Correct Answer: 35. (a, c)

Solution:

  1. For closed organ pipe,

f=n(v4l) where, n=1,3,5l=nv4f For n=1,l1=(1)(330)4×264×100cm=31.25cm For n=3,l3=3l1=93.75cm For n=5,l5=5l1=156.25cm Correct options are (a) and (c). 



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