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Q.

In a photoelectric experiment, kinetic energy of photoelectrons was plotted aganist the frequency of incident radiation (v), as shown in figure. Which of the following statements is correct?

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a

The threshold frequency is v1

b

The slope of this line is equal to Planck's constant

c

As the frequency of incident radiation increase kinetic energy of photoelectrons decreases

d

It is impossible to obtain such a graph.

answer is B.

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Detailed Solution

KE = hv- hvºKE(y) = hv - hvºA straight line graph with a positive slope (h) and a negative y - intercept (-hvº).
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