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  4. If the velocity of radio waves is 3 x 105 km/s. The frequency corresponding to wavelength of 300 m is :

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Q. If the velocity of radio waves is 3 x 105 km/s. The frequency corresponding to wavelength of 300 m is :

JIPMERJIPMER 1998

Solution:

Here: velocity of radio waves $ =3\times {{10}^{5}}km\text{/}\sec $ $ =3\times {{10}^{8}}km\text{/}\sec $ and wavelength $ \lambda =300\,m $ $ frequency\,f=\frac{velocity\,of\,radiowaves}{wavelength} $ $ =\frac{3\times {{10}^{8}}}{300}={{10}^{6}}Hz=1MHz $