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  4. A radio transmitter radiates 1 kW power at a wavelength 198.6 m. How many photons does it emit per second?

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Q. A radio transmitter radiates 1 kW power at a wavelength 198.6 m. How many photons does it emit per second?

VMMC MedicalVMMC Medical 2010

Solution:

Number of photons $ n=\frac{P}{E}=\frac{P}{hv}=\frac{P\lambda }{hc} $ $ =\frac{1000\times 198.6}{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}\approx {{10}^{30}} $