Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE MainPhysicsDual Nature of Matter

When monochromatic light of a certain wavelength is incident on a metal X having a work function of 1.8 eV , the stopping potential for the emitted photoelectrons is measured to be 1.4 V . If the same light is incident on another metal Y having a work function of 3.8 eV , the photoelectric emission:

Options

  1. Aoccurs with a stopping potential of 0.6 V
  2. Boccurs with a stopping potential of 1.4 V
  3. Coccurs with a stopping potential of 2.0 V
  4. Ddoes not occur

Correct answer

D. does not occur

Step-by-step solution

According to Einstein's photoelectric equation, the energy of the incident photon E is related to the work function and the stopping potential V_s by: E = + eV_s For metal X: _X = 1.8 eV V_ s,X = 1.4 V eV_ s,X = 1.4 eV The energy of the incident light is: E = 1.8 eV + 1.4 eV = 3.2 eV Now, this same light of energy E = 3.2 eV is incident on metal Y. The work function of metal Y is _Y = 3.8 eV . Since the incident photon energy ( 3.2 eV ) is strictly less than the work function of metal Y ( 3.8 eV ), no electrons can

Practice Dual Nature of Matter on Quantrex Academy →

More from Dual Nature of Matter

K₁ and K₂ be the maximum kinetic energies of photoelectrons emitted from a surface of a given material for the light of wavelength ₁ and ₂ , respectively. If ₁=2 ₂ then the work fu 2026The de Broglie wavelength for an electron accelerated through the potential difference of V₁ volt is ₁ . When the potential difference is changed to V₂ volt, the associated de Brog 2026Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The electromagnetic wave exerts pressure on the surface on 2026An electron is travelling with a velocity v in free space and when it enters a medium, its velocity is reduced by 20 % . The de Broglie wavelength of electron in the medium is ₀ , 2026An electron of mass m is moving in an electric field E = -2E₀ i ( E₀ = constant > 0 ), with an initial velocity V = v₀ i ( v₀ = constant > 0 ). If ₀ = h 4mv₀ , its de Broglie wavel 2026Light source having wavelength 331 nm is used to generate photo-electrons whose stopping potential is 0.2 V. The work function of the used metal in the experiment is 10⁻¹⁹ J. The v 2026Match the List-I with List-II List-I List-II A. Planck's constant I. ML^2T⁻² B. Stopping potential II. T⁻¹ C. Work function III. ML^2T⁻¹ D. Threshold frequency IV. ML^2T⁻³A⁻¹ Choos 2026The de Broglie wavelength associated with an electron accelerated through a potential difference V is _e and the de Broglie wavelength associated with a proton accelerated through 2026 Full Dual Nature of Matter list All JEE Main PYQs