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  4. If a source of power 4 kW produces 1020 photons/second, the radiation belong to a part of the spectrum called

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Q. If a source of power $4\, kW$ produces $10^{20}$ photons/second, the radiation belong to a part of the spectrum called

AIEEEAIEEE 2010Dual Nature of Radiation and Matter

Solution:

$4 \times 10^{3} = 10^{20} \times hf$
$f = \frac{4 \times 10^{3} }{10^{20}\times 6.023\times 10^{-34}}$
$f = 6.03 \times 10^{16} \,Hz$
The obtained frequency lies in the band of X-rays.