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
$v\;{(3/4)^{1/2}}$
$v\;{(4/3)^{1/2}}$
$ < v\;{(4/3)^{1/2}}$
$ > v\;{(4/3)^{1/2}}$
A monochromatic beam of light of wavelength $400\,nm$ incident normally upon a photosensitive surface ($25\%$ reflects and rest absorbs), produces a pressure of $5 \times 10^{-7}\,Nm^{-2}$ on it. If $0.1\%$ of the incident photons produce electrons then corresponding saturation current will be..............$\mu A$ (consider area of photosensitive surface $= 5\,cm^2$)
Compton effect supports that
If the momentum of a photon is $p$, then its frequency is
Where $m$ is the rest mass of the photon
Given below are two statements
Statement$-I :$ Two photons having equal linear momenta have equal wavelengths.
Statement$-II :$ If the wavelength of photon is decreased, then the momentum and energy of a photon will also decrease.
In the light of the above statements, choose the correct answer from the options given below.
Quantam nature of light is explained by which of the following phenomenon