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What is stopping potential?

  1. minimum voltage required to stop electrons ejecting from the atom
  2. minimum voltage required to stop protons ejecting from the atom
  3. minimum voltage required to stop electrons from moving between plates
  4. minimum voltage required to stop protons from moving between plates

Answer (Detailed Solution Below)

Option 3 : minimum voltage required to stop electrons from moving between plates
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Detailed Solution

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CONCEPT:

  • Stopping potential: The voltage difference that is required to stop electrons ejected due to the photoelectric effect from moving between plates and creating a current in the photoelectric experiment is called stopping potential.
    • In the photoelectric experiment, light is directed onto a metal plate and if the frequency of light is high enough, electrons are ejected from the surface. 

​

EXPLANATION:

  • When the electrons are ejected due to photoelectric effects, they start to move away from the metal surface. 
  • The voltage difference required that is required to stop electrons ejected due to the photoelectric effect from moving between plates and creating a current in the photoelectric experiment is called stopping potential.
  • The stopping voltage is used to determine the kinetic energy that the electrons have as they are ejected from the metal plate.
  • Hence the correct answer is option 3.

  • Photoelectric effect: The emission of electrons when electromagnetic radiation, such as light, hits a material is called the Photoelectric Effect.
  • Photoelectrons: Electrons emitted in this manner are called photoelectrons.

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More Einstein’s Photoelectric Equation Questions

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