$A$ photon of frequency $v$ has a momentum associated with it. If the speed of light is $c$,then the momentum is .......

Consider the figure for photoemission. How would you reconcile this with the law of conservation of momentum? Note that light (photons) has momentum in a different direction than the emitted electrons.

The number of photons of wavelength $540 \ nm$ emitted per second by an electric bulb of power $100 \ W$ is (taking $h = 6 \times 10^{-34} \ J \cdot s$ and $c = 3 \times 10^8 \ m/s$):

The frequency of a photon having energy $66 \ eV$ is:

Which of the following is true for a photon?

In pair annihilation,an electron and a positron destroy each other to produce gamma radiation. How is the momentum conserved?