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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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