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

In a photoelectric effect experiment, the stopping potential is measured for monochromatic light beams of varying wavelengths. Determine the work function of the emitter from the experimental data. wavelength (nm) 350 400 450 500 550 stopping potential (V) 1.45 1.00 0.66 0.38 0.16

Options

  1. A2.15 eV
  2. B1.08 eV
  3. C3.15 eV
  4. D4.30 eV

Correct answer

A. 2.15 eV

Step-by-step solution

According to Einstein's photoelectric equation: eV_s = hc - where V_s is the stopping potential, is the wavelength of incident light, and is the work function of the material. Using the standard value hc 1240 eV nm , we can calculate the work function for the given data points. For = 400 nm and V_s = 1.00 V : = 1240 400 - 1.00 = 3.10 - 1.00 = 2.10 eV For = 500 nm and V_s = 0.38 V : = 1240 500 - 0.38 = 2.48 - 0.38 = 2.10 eV The calculated work function is approximately 2.10 eV . Among the given choices, the closest

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