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Q.

A student determines the velocity of sound with the help of a closed organ pipe. If the observed length for fundamental frequency is 24.7 m, the length for third harmonic will be 

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a

73.1 cm

b

75.4 cm 

c

72.7 cm 

d

74.1 cm 

answer is A.

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Detailed Solution

l2=3l1=3×24.7=74.1 cm

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A student determines the velocity of sound with the help of a closed organ pipe. If the observed length for fundamental frequency is 24.7 m, the length for third harmonic will be