A certain string will resonant to several frequencies, the lowest of which is $200 \,cps$. What are the next three higher frequencies to which it resonants?
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(a)
Resonant frequency occurs according to $\frac{n v}{2 l}$ and when $n=1$ frequency is minimum.
Hence $\frac{v}{2 l}=200[n=1]$
Other resonant frequencies will be simply multiples of fundamental frequency. Hence $(a)$ is the answer.
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