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$5$
AIPMT 2009, Medium
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