Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
AP EAMCET202018 Sep 2020Morning ShiftPhysicsDual Nature of MatterActual

The retarding potential necessary to stop the emission of photoelectrons, when a target material of work function (1.24 eV ) is irradiated with light of wavelength (4.36 10⁻⁷ ~m ) is

Options

  1. A(4.08 eV )
  2. B(2.84 eV )
  3. C(1.60 eV )
  4. D(0.36 eV )

Correct answer

C. (1.60 eV )

Step-by-step solution

Given, work function, ( ₀=1.24 eV ) (=1.24 1.6 10⁻¹⁹ ~J ) Wavelength, ( =4.36 10⁻⁷ ~m ) According to Einstein's photoelectric equation, ( gathered e V₀= h c - ₀ e V₀= 6.63 10⁻³⁴ 3 10^8 4.36 10⁻⁷ -1.24 1.6 10⁻¹⁹ V₀= 6.63 10⁻³⁴ 3 10^8 1.6 10⁻¹⁹ 4.36 10⁻⁷ -1.24 =2.85-1.24=1.61 ~V 1.60 ~V gathered )

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