Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
Concepts Of Physics MCQ Edition [Volume 2]PhysicsPhotoelectric Effect and Wave–Particle Duality

The plot of the stopping potential versus the frequency of the light used in an experiment on the photoelectric effect is a straight line. The stopping potential is 0 V at a frequency of 1 10¹⁴ Hz and 1.656 V at a frequency of 5 10¹⁴ Hz . Determine the work function.

Options

  1. A1.656 eV
  2. B0.207 eV
  3. C0.414 eV
  4. D4.14 eV

Correct answer

C. 0.414 eV

Step-by-step solution

According to Einstein's photoelectric equation: eV = h - From the given graph, the stopping potential is 0 V at the threshold frequency ₀ = 1 10¹⁴ Hz . Thus, the work function is = h ₀ = h(1 10¹⁴) . At = 5 10¹⁴ Hz , the stopping potential is V = 1.656 V . Substituting these values into the equation: e(1.656) = h(5 10¹⁴) - Substituting h(1 10¹⁴) = into the above equation: 1.656 eV = 5 - 4 = 1.656 eV = 1.656 4 eV = 0.414 eV

Practice Photoelectric Effect and Wave–Particle Duality on Quantrex Academy →

More from Photoelectric Effect and Wave–Particle Duality

Determine the net energy absorbed by an atom during a process in which it absorbs a photon of wavelength 500 nm and subsequently emits another photon of wavelength 700 nm .Compute the number of photons emitted per second by a 10 W sodium vapour lamp. Assume that 60 % of the consumed energy is converted into light. The wavelength of sodium light is 59Assuming the sun is directly overhead, the surface of the earth receives sunlight at 1.4 imes 10^3 W m ⁻² . Treat the light as monochromatic with an average wavelength of 500 nm , Assuming the sun is directly overhead, the surface of the earth receives sunlight at 1.4 10^3 W m ⁻² . Treat the light as monochromatic with an average wavelength of 500 nm , and aAssuming the sun is directly overhead, the surface of the earth receives sunlight at 1.4 10^3 W m ⁻² . Treat the light as monochromatic with an average wavelength of 500 nm , and aDetermine the momentum of a light photon that has a wavelength of 500 nm .Visible light encompasses wavelengths ranging from 400 nm to 780 nm . Determine the energy range of the photons of visible light.A beam of white light strikes a plane surface normally. The surface absorbs 70 % of the light while reflecting the remainder. Determine the force exerted on the surface by the beam Full Photoelectric Effect and Wave–Particle Duality list All Concepts Of Physics MCQ Edition [Volume 2] PYQs