Question

1 kilowatt radio transmitter operated at a frequency of 880 Hz how many photons per second does it in it emit..

Answer 1

One KW is the power or energy per unit time. 1000 J/s is the power.

In general we know that, E=HV.

Where E=energy of a single photon,

H = Planck‘s constant and

V=frequency of the photon and

Now simply equate as power = energy/sec.

Even Suppose photons are emitted per second, then we can say- Power=nHV.