Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
AP EAMCET201923 Apr 2019Morning ShiftPhysicsDual Nature of MatterActual

Light of wavelength (488 ~nm ) produced by an Agron laser is used in the photoelectric effect. When light from this spectral line is incident on the cathode, the stopping potential of the photoelectrons is (0.38 ~V ). The work function of the cathode material is

Options

  1. A(2.16 eV )
  2. B(216 eV )
  3. C(21.6 eV )
  4. D(0.216 eV )

Correct answer

A. (2.16 eV )

Step-by-step solution

Given, light of wavelength, ( =488 ~nm ) and stopping potential, of photoelectrons, (V=0.38 ~V ) As, energy of photon (E= h c = 1250 488 eV ) So, (E=2.56 eV ) ( ) Maximum kinetic energy of a photo-electron ( KE _ =e V₀ ) Where, (V₀= ) stopping potential ( KE _ =e V₀=0.38 eV ) From Einstein's photoelectric equation, ( aligned & E= KE _ +W₀ & W₀=E- KE _ & =2.56-0.38=2.18 2.16 eV aligned ) Hence, the work function of cathode material is (2.16 eV ). So, the correct option is (a).

Practice Dual Nature of Matter on Quantrex Academy →

More from Dual Nature of Matter

The basic principle used behind the working of electron microscope is: 2026The variation of the stopping potential ( V₀ ) with the frequency of incident radiation(n) is as given below. [ n₀ - threshold frequency. h- Planck's constant e- electronic charge] 2026When metal of work function 1.4eV is exposed to a radiation, the maximum kinetic energy of the electron emitted is 0.4eV. The stopping potential required is: 2026A monochromatic beam of photons of intensity to 1.5 Wm⁻² and energy 11.2 eV is incident on a material of work function 4.8 eV. What is the maximum speed of photoelectrons emitted d 2026What is the ratio of de Broglie wavelength of an electron to that of proton if the velocity of proton is 1 6 the velocity of electron? 2026Consider normal incidence of a monochromatic beam of photons of power P on a flat surface. Of the incident beam, 10% gets absorbed, 10% gets transmitted, and the rest is reflected 2026An experimental study of the photoelectric effect involves a metal of work function ₀ . What is the smallest wavelength of the incident photon to photoemit an electron of mass m wh 2026Work function of the metal is 2026 Full Dual Nature of Matter list All AP EAMCET PYQs