Wave Motion 2 Question 26

26. A cylindrical tube, open at both ends, has a fundamental frequency f in air. The tube is dipped vertically in water so that half of its length is in water. The fundamental frequency of the air column is now

(1981, 2M)

(a) f/2

(b) 3f/4

(c) f

(d) 2f

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Answer:

Correct Answer: 26. (c)

Solution:

  1. Initially the tube was open at both ends and then it is closed.

fo=v2lo and fc=v4lc

Since, tube is half dipped in water, lc=lo2

fc=v4(lo2)=v2lo=fo=f



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