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Q. A $12\, m$ long vibrating string has the speed of wave $48 \,m/s$. To what frequency it will resonate?

Waves

Solution:

$v=48 \,m / s , l=12 \,m , f=\frac{n v}{2 l}$
$f=2 \,n ($ where $n=1,2,3 \ldots \ldots)$