A) Work function is defined as the minimum energy needed to make the electron free from the atom
B) Photoelectric effect can take place if light has been incident on a free electron
C) Photon works on the principle of all or nothing while energy transfer
D) All of the above
Correct Answer: C
Solution :
Work function is defined as minimum energy, needed to detach an electron from the metal and not from atom. Photoelectric effect is not possible at all with free electron.
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