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If a metal has a work function of 2.0 eV, what is the maximum kinetic energy of

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Question: If a metal has a work function of 2.0 eV, what is the maximum kinetic energy of the emitted electrons when illuminated with light of 5.0 eV energy?

Options:

  1. 3.0 eV
  2. 2.0 eV
  3. 5.0 eV
  4. 0 eV

Correct Answer: 3.0 eV

Solution: 

The maximum kinetic energy can be calculated using KE = hf - Ο†. Here, KE = 5.0 eV - 2.0 eV = 3.0 eV.

If a metal has a work function of 2.0 eV, what is the maximum kinetic energy of

Practice Questions

Q1
If a metal has a work function of 2.0 eV, what is the maximum kinetic energy of the emitted electrons when illuminated with light of 5.0 eV energy?
  1. 3.0 eV
  2. 2.0 eV
  3. 5.0 eV
  4. 0 eV

Questions & Step-by-Step Solutions

If a metal has a work function of 2.0 eV, what is the maximum kinetic energy of the emitted electrons when illuminated with light of 5.0 eV energy?
Correct Answer: 3.0 eV
  • Step 1: Understand the work function (Ο†). The work function is the minimum energy needed to remove an electron from the metal. In this case, Ο† = 2.0 eV.
  • Step 2: Understand the energy of the light (hf). The energy of the light that hits the metal is given as 5.0 eV.
  • Step 3: Use the formula for maximum kinetic energy (KE). The formula is KE = hf - Ο†.
  • Step 4: Substitute the values into the formula. KE = 5.0 eV - 2.0 eV.
  • Step 5: Calculate the maximum kinetic energy. KE = 3.0 eV.
  • Photoelectric Effect – The phenomenon where electrons are emitted from a material when it is exposed to light of sufficient energy.
  • Work Function – The minimum energy required to remove an electron from the surface of a metal.
  • Kinetic Energy of Emitted Electrons – The energy of the emitted electrons, calculated as the difference between the energy of the incoming photons and the work function of the metal.
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