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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