$A$ radio transmitter operates at a frequency of $880 \ kHz$ and a power of $10 \ kW$. The number of photons emitted per second is .......

The energy of a photon whose frequency is $10^{12} \text{ MHz}$ is:

If sources of ultraviolet $(\lambda \approx 400 \ nm)$,visible $(\lambda \sim 550 \ nm)$,and infrared $(\lambda \sim 700 \ nm)$ radiation each have a power rating of $100 \ W$,then the number of photons emitted per unit area per unit time is maximum for:

$A$ particle which has zero rest mass and non-zero energy and momentum must travel with a speed

$A$ radio transmitter operates at a frequency of $880 \, kHz$ and a power of $10 \, kW$. The number of photons emitted per second is:

The momentum of a photon with frequency $1.5 \times 10^{13} \ Hz$ is .......