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A fork of frequency 256 Hz resonates with a closed organ pipe of length 25.4 cm. If the length of pipe be increased by 2 mm

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A fork of frequency 256 Hz resonates with a closed organ pipe of length 25.4 cm. If the length of pipe be increased by 2 mm, the number of beats/sec. will be 

(a) 4 

(b) 1 

(c) 2 

(d) 3

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Best answer

Correct option: (c) 2

Explanation: 

No. of beats/sec = n1 – n2 = 256 – 254 = 2

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