This question refers to laser light passing through a monochromatic filter and f

Question

This question refers to laser light passing through a monochromatic filter and falling on a clean pece of metal. assume v is the maximum speed of the emitted photoelectrons. n is the number of photoelectrons emitted per second.

lab: http://www.physics.qc.edu/files/59

If the original metal is changed so it now has a higher cut-off frequency, then

- v decreases, n remains the same

- v increases, n remains the same

- v increases, n increases

- v increases, n decreases

- v remains the same, n decreases

- v remains the same, n remains the same

- v remains the same, n increases

- v decreases, n remains the same

- v decreases, n increases

Explanation / Answer

the correct option is,

v increases, n remains the same

becuse,

k.E of the photo electron depends on the frequency of incident light

if frequency increases, K.E or speed of the photo electron increases

and

n- no of photo electrons emitted per second depends on the intensity of light

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