The energy of a photon of wavelength $\lambda$ is given by

The radiation with frequency $1.0 \times 10^{14} \ Hz$ lies in the infrared region. The energy of one photon of this radiation in joules is:

An $AIR$ station is broadcasting waves of wavelength $300 \ m$. If the radiating power of the transmitter is $10 \ kW$,then the number of photons radiated per second is:

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

Two sources of light emit with a power of $200 \ W$. The ratio of the number of photons of visible light emitted per second by each source having wavelengths $300 \ nm$ and $500 \ nm$ respectively,will be:

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