Question

In a photoelectric emission, electrons are ejected from metals X and Y by light of frequency f. The potential difference V required to stop the electrons is measured for various frequencies. If y has a greater work function than X, which graph illustrates the expected results?

A

B

C

D

Hard

Solution

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Correct option is
A

The answer is option A. 
First, the gradient of the graph cannot change (always = h/e ), so answers are A or D.
If Y has a greater work function than X, then the graph for Y should have a more negative y-intercept. therefore figure in option A depicts the concept.

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Assertion

As work function of a material increase by some mechanism, it requires greater energy to excite the electrons from its surface.

Reason

A plot of stopping potential versus frequency for different metals, has greater slope for metals with greater work functions.

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