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Light of wavelength l shines on a metal surface with intensity x and the metal emits electrons per second of average energy, Z. What will happen to Y and Z if x is doubled?

a) Y will be double and Z will become half
b) Y will remain same and Z will be doubled
c) Both Y and Z will be doubled
d) Y will be doubled but Z will remain same

Answer: d
Explanation: When intensity is doubled, number of electrons emitted per second is also doubled but average energy of photoelectrons emitted remains the same.

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