How many photons per second are emitted by the antenna of a microwave oven if its power output is 1.00 kw at a frequency of 2515 mhz?

The power of the antenna is

and since the power is the emitted energy divided by the time, the energy emitted per second is


The frequency of the emitted photons is

So the energy of a single photon is


Therefore, to find the number of emitted photons per second, we should divide the total energy emitted by the antenna in 1 second by the energy of a single photon:

The duration of a photographic flash is related to an rc time constantly