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A photoelectric experiment is performed by with three metal plates A, B and C for a particular light intensity and frequency f. The figure shows a graph plotted between stopping potential V and the frequency f for the three metals. From graph, which of the following statements are true?

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Slope of the graph is (h/e) for all metal surfaces.

Slope of the graph is constant for every metal surface

For every metal, the stopping potential is proportional to the frequency of light

For every metal, the stopping potential is proportional to threshold frequency

answer is C, D.

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Detailed Solution

The photoelectric equation for the metals is

${eV}_{0} = h υ - h υ_{0}$

$\Rightarrow V_{o} = (\frac{h}{e}) υ - \frac{W_{0}}{e}$

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