Question : For photoelectric effect to take place, the metal used as the cathode should have_________
Option 1: high melting point
Option 2: low melting point
Option 3: low work function
Option 4: low resistance
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Correct Answer: low work function
Solution : The correct option is low work function.
Work function is the minimum energy required to remove an electron from the surface of the metal. A lower work function means that it requires less energy to liberate an electron. So, for the photoelectric effect to take place, the metal used as the cathode should have alow work function.
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