If a source of power \( 4 \mathrm{~kW} \) produces \( 10^{20} \) ph...

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If a source of power \( 4 \mathrm{~kW} \) produces \( 10^{20} \) photons
\( \mathrm{P} \)
per second, the radiation belongs to a part of the
W
spectrum called:
(1) microwaves
(2) \( \gamma \)-rays
(3) X-rays
(4) UV rays
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