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Q.

An ideal organ pipe resonates at successive frequencies of 50 Hz, 150 Hz, 250 Hz, etc (speed of sound = 340 m/s) The pipe is

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a

open at both ends and of length 3.4 m

b

open at both ends and of length 6.8 m

c

closed at one end, open at the other, and of length 1.7 m

d

closed at one end, open at the other, and of length 3.4 m

answer is C.

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Detailed Solution

The frequencies given are odd multiple of fundamental. Hence close organ pipe50=14l×340⇒l=1.7m
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