$A$ transmitter of power $10 \text{ kW}$ emits radio waves of wavelength $500 \text{ m}$. The number of photons emitted per second by the transmitter is of the order of:

Monochromatic light of frequency $6 \times 10^{14} \,Hz$ is produced by a laser. The power emitted is $2 \times 10^{-3} \,W$. How many photons per second on an average are emitted by the source? (Given $h = 6.63 \times 10^{-34} \,Js$)

If a photon has velocity $c$ and frequency $\nu$,then which of the following represents its wavelength?

Consider two black bodies $A$ and $B$ having equal surface areas. On the surface of $A$,$n$ photons of frequency $f$ are incident perpendicularly in a time $t$. On the surface of $B$,$2n$ photons of frequency $3f$ are incident perpendicularly in a time $4t$. The ratio of average intensity of radiation on surface $A$ to that on surface $B$ is

The relationship between the velocity and frequency of a photon in a vacuum is represented by a ...... .

How is the intensity of radiation determined?