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The SI unit of work function of a metal used in photoelectric effect is
1. joule (J)
2. newton (N)
3. pascal (Pa)
4. hertz (Hz)

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Correct Answer - Option 1 : joule (J)

The correct answer is option 1) i.e. joule (J)

CONCEPT:

  • Work function: It is the minimum amount of energy required to cause photo-emission of electrons from a metal surface when light is incident on it.
    • The work function is also known as the threshold energy.
    • The energy of the incident light is equal to the sum of the work function and the photoelectron kinetic energy.
    • Therefore, the total energy of photon = work function + maximum kinetic energy of the electron.

The energy of a photon is given by the equation:

 \(E =hν\)

Where ν is the frequency of incident light and h is the Planck's constant.

EXPLANATION:

  • The work function is a measure of energy. All forms of energy have the same SI unit i.e. joule (J).

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