1
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Question

An organ pipe closed at one end has fundamental frequency of 1500Hz. The maximum number of overtones generated by this pipe which a normal person can hear is

A
4
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B
13
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C
6
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D
9
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Solution

The correct option is C 6In an organ pipe only odd harmonics are found. So, frequency equal.to odd multiple of 1500Hz may be found in this case. Maximum audible frequency is 20,000Hz. So, possible frequency are 1500Hz, 4500Hz, 7500Hz, 10500Hz, 13500Hz, 16500Hz, 19500Hz. 19500Hz will be sixth overtone as 4500 will be first overtone.

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