Quantam nature of light is explained by which of the following phenomenon
Huygen wave theory
Photoelectric effect
Maxwell electromagnetic theory
de-Broglie theory
In photoelectric effect, the electrons are ejected from metals if the incident light has a certain minimum
A $200\, W$ sodium street lamp emits yellow light of wavelength $0.6\, \mu \,m$. Assuming it to be $50\%$ efficient in converting electrical energy to light, the number of photon of yellow light it emits per second is
The momentum of a photon in an $X-$ ray beam of ${10^{ - 10}}$ metre wavelength is
In a dark room of photography, generally red light is used. The reason is
If the two metals $A$ and $B$ are exposed to radiation of wavelength $350\,nm$. The work functions of metals $A$ and $B$ are $4.8\,eV$ and $2.2\,eV$. Then choose the correct option