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Q.

The maximum energy Kmax of photoelectrons emitted in a photoelectric cells is measured using lights of various frequencies v. The graph in shows how Kmaxvaries with v. The slope of the graph is equal to
 

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a

the charge of an electron

b

the charge of mass ratio of an electron

c

 the work function of the emitter in the cell 

d

 Planck’s constant.

answer is D.

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Detailed Solution

 Since Kmax=hv−v0, the slope of the graph of Kmax against v is h, the Planck's constant. 

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