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

  • [AIPMT 1998]
  • [AIIMS 2008]
  • [JEE MAIN 2016]
  • A

    $v\;{(3/4)^{1/2}}$

  • B

    $v\;{(4/3)^{1/2}}$

  • C

    $ < v\;{(4/3)^{1/2}}$

  • D

    $ > v\;{(4/3)^{1/2}}$

Similar Questions

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.

  • [JEE MAIN 2021]

Quantam nature of light is explained by which of the following phenomenon