A radio station broadcasts at a frequency $=91\mathrm{.}5$ MHz with a total radiated power of P $=20$ kW$.1.$ What is the wavelength of this radiation? $2.$ What is the energy of each photon in eV$?$ How many photons are emitted each second? How many photons are emitted in each cycle? $3.$ A particular radio receiver requires $2\mathrm{.}0$ microwatts of radiation to provide intelligible reception. How many $91\mathrm{.}5$ MHz photons does this require per second? per cycle? $4.$ Do the answers to $($b$)$ and $($c$)$ indicate that the granularity of the electromagnetic radiation can be neglected in these circumstances?