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KVPY SX SB Exam 19-Nov-2017 Question Paper

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Question : 38

Total: 120

A closed pipe of length 300 cm contains some sand. A speaker is connected at one of its ends. The frequency of the speaker at which the sand will arrange itself in 20 equidistant piles is close to (velocity of sound is 300 m/s)

10 kHz
5 kHz
1 kHz
100 kHz

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