A) 20
B) 80
C) 40
D) 120
Correct Answer: B
Solution :
When the string is plucked in the middle, it vibrates in one loop with nodes at fixed ends and an antinode in the middle. So that, \[\frac{{{\lambda }_{2}}}{2}=l\] \[\Rightarrow \] \[{{\lambda }_{1}}=2\times 40=80\,cm\]You need to login to perform this action.
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