Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
MHT CET202311 May 2023Morning ShiftPhysicsDual Nature of MatterActual

The maximum kinetic energies of photoelectrons emitted are K₁ and K₂ when lights of wavelengths ₁ and ₂ are incident on a metallic surface. If ₁=3 ₂ then

Options

  1. AK ₁= K ₂ 3
  2. BK ₁ < K ₂ 3
  3. CK ₁=3 ~K ₂
  4. D3 ~K ₁=2 ~K ₂

Correct answer

B. K ₁ < K ₂ 3

Step-by-step solution

Kinetic energy of the photoelectrons K = hc - For wavelength ₁ , K ₁= hc ₁ - For wavelength ₁ , K ₂= hc ₂ - Subtracting equation (i) from equation (ii), aligned & K ₂- K ₁= hc ₂ - - hc ₁ + & K ₂- K ₁= hc ₂ - hc 3 ₂ & ~K ₂- K ₁= 2 3 hc ₂ & hc ₂ = 3 2 ( ~K ₂- K ₁ ) aligned Substituting equation (iii) in equation (ii), aligned & K ₂= 3 2 ( ~K ₂- K ₁ )- & 2 ~K ₂=3 ~K ₂-3 ~K ₁-2 & K ₂-3 ~K ₁=2 & As , >0 & ~K ₂-3 ~K ₁>0 & ~K ₁ < K ₂ 3 aligned

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 MHT CET PYQs