Question

The photoelectric effect can be considered as a
1. Adiabatic process
2. Isochoric process
3. Instantaneous process
4. All of the above

Answer 1

Correct Answer - Option 3 : Instantaneous process

The correct answer is option 3) i.e. Instantaneous process

CONCEPT:

• Photoelectric effect: The photoelectric effect is a phenomenon where electrons are ejected from a metal surface when the light of sufficient frequency is incident on it.
  • The ejected electrons are called photoelectrons.
  • Typically, the time lag between the incidence of light and emission of electrons is less than or equal to 10-9 s.

EXPLANATION:

• Since the time lag is negligibly small, the photoelectric effect can be assumed to be an instantaneous process.

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Isochoric process	It is a process where the change in volume is zero. As the change in volume is zero, the work done is zero.
Adiabatic process	It is a process in which no heat is exchanged between the system and the surrounding i.e. the system is insulated. It is represented mathematically as PVγ = constant