Question

Work function of a metal changes if it is heated or it is cooled or it is coated or all of these

Answer 1

All of these.

Beacause work function of a metal varies linearly with temperature.

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Answer 2

Work function of a metal changes all of these

Explanation:

• The work function of a substantial can be measured with PES and Kelvin probe (KP).
• While PES permits the dimension of the absolute work function, KP only gives the contact potential difference (CPD) between the actual probe and the sample surface.
• The work function is the difference between the energy of the most excited electrons in the conduction band and the vacuum.
• It's the energy required to take an electron from the conduction band and remove it to outside the metal.

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