Which of one is correct
${E^2} = {p^2}{c^2}$
${E^2} = {p^2}c$
${E^2} = p{c^2}$
${E^2} = {p^2}/{c^2}$
(a) Momentum $p = \frac{E}{c}\, \Rightarrow \,{E^2} = {p^2}{c^2}$
The work function of a photoelectric material is $3.3 eV$. The threshold frequency will be equal to
In a photoemissive cell with executing wavelength $\lambda $, the fastest electron has speed $v.$ If the exciting wavelength is changed to $\frac{{3\lambda }}{4}$, the speed of the fastest emitted electron will be
A $200\, W$ sodium street lamp emits yellow light of wavelength $0.6\, \mu m$. Assuming it to be $25\%$ efficient in converting electrical energy to light, the number of photon of yellow light it emits per second is
The velocity of photon is proportional to (where $v$ is frequency)
The light of two different frequencies whose photons have energies $3.8 \,eV$ and $1.4 \,eV$ respectively, illuminate a metallic surface whose work function is $0.6 \,eV$ successively. The ratio of maximum speeds of emitted electrons for the two frequencies respectivly will be
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