Dual Nature Of Light Question 313
Question: A radio transmitter radiates 1 kW power at a wavelength 198.6 metres. How many photons does it emit per second [Kerala (Engg.) 2002]
Options:
A) $ 10^{10} $
B) $ 10^{20} $
C) $ 10^{30} $
D) $ 10^{40} $
Show Answer
Answer:
Correct Answer: C
Solution:
$ 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} $ .
BETA
