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queenstudy
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Homework Statement
A radio station operates at a frequency 103.7MHz with a power output of 200kW.
1)Determine the rate of emission of quanta from the station.
2)If we treat the radio station as a point source radiatng uniformly in all directions, find the number of photons inside a cubical radio 20cm on a side located 15km away from the radio station
Homework Equations
The Attempt at a Solution
1) i solved it by finding the energy of one photon and then N/t= 200000/Energy of one photon =2.91 *10^30 quanta/s
2) I thought that the power i have should be multiplied by 4∏d^2 / a^2 where a is the side of the radio and d is the distance from the source to the radio box and then i have the time needed to reach the dario which is d/c so the number of photons is to be 2.75*10^10 photons but it didnt please help