JEE Main | 2014Sound WavesHard
Question
A pipe of length 85 cm is closed from one end. Find the number of possible natural oscillations of air column in the pipe whose frequencies lie below1250 Hz. The velocity of sound in air is 340 m/s.
Options
A.12
B.8
C.6
D.4
Solution
f = 
≤ 1250
⇒
≤ 1250
⇒ 2n - 1 ≤ 12.5
∴ Answer is 6.
≤ 1250⇒
≤ 1250⇒ 2n - 1 ≤ 12.5
∴ Answer is 6.
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