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Question

Light of wavelength λ 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?



A

Y will be doubled and Z will become half. 

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B

Y will remain same and Z will be doubled. 

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C

Both Y and Z will be doubled. 

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D

Y will be doubled but Z will remain same.  

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Solution

The correct option is D

Y will be doubled but Z will remain same.  


When know that,

In photoelectric effect:

 The number of electrons ejected are proportional to intensity of light

Intensity does not affect average energy of photo-electrons.

Now, when intensity is doubled

Number of electrons emitted per second will be doubled. (y) No effect on average energy of photo-electrons. (z)

Y  Doubled

Z  Same


Chemistry

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