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

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The threshold frequency is v₁

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

It is impossible to obtain such a graph.

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

answer is B.

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Detailed Solution

The slope of the line is equal to the plank's constant

hv =hv₀ + K.E

K.E = hv - hv₀

The above equation with the equation of a straight line (y=mx+c)

so the slope of the graph between KE and v is Planck's Constant.

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