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Each of the two strings of length 51.6 c...

Each of the two strings of length 51.6 cm and 49.1 cm are tensioned separately by 20 N force. Mass per unit length of both the strings is same and equal to 1 g/m. When both the strings vibrate simultaneously the number of beats is :

A

7

B

8

C

3

D

5

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The correct Answer is:
A
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