1.

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

Answer»

Y will be doubled and Z will become half
Y will remain same and Z will be doubled
Both Y and Z will be doubled.
Y will be doubled but Z will remain same

Solution :When intensity is doubled number of ELECTRONS emitted per second is ALSO doubled but average energy of photoelectrons emitted REMAINS the same.
Hence D is the correct answer.


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