Question
(a) If the power output of a 650-kHz radio station is 50.0 kW, how many photons per second are produced? (b) If the radio waves are broadcast uniformly in all directions, find the number of photons per second per square meter at a distance of 100 km. Assume no reflection from the ground or absorption by the air.
1. $1.16 \times 10^{32} \textrm{ photons/s}$
2. $9.24 \times 10^{20} \textrm{ photons/(s} \cdot \textrm{m}^2\textrm{)}$
Solution Video