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  4. The speed of wave in a medium is 650 m/s. If 3500 waves are passing through a point in the medium in 1.67 min, then its wavelength will be:

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Q. The speed of wave in a medium is $650\, m/s$. If $3500$ waves are passing through a point in the medium in $1.67\, min$, then its wavelength will be:

Jharkhand CECEJharkhand CECE 2003

Solution:

As we have given that $3500$ waves are passing through a point in the medium in $1.67\, min$,
so frequency of the wave,
$ n=\frac{3500}{1.67\times 60}\approx 35/s $
Hence, wavelength of the wave, $ \lambda =\frac{v}{n} $
$ =\frac{650}{35}=18.57\,m $