Gujarati
11.Dual Nature of Radiation and matter
medium

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

A

${10^{10}}$

B

${10^{20}}$

C

${10^{30}}$

D

${10^{40}}$

Solution

(c) $P = \frac{W}{t} = \frac{{nhc}}{{\lambda t}} $

$\Rightarrow {10^3} = \frac{{n \times 6.6 \times {{10}^{ – 34}} \times 3 \times {{10}^8}}}{{198.6 \times 1}}$

$ \Rightarrow n = {10^{30}}$.

Standard 12
Physics

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