In a photoelectric experiment, kinetic e...

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

The threshold frequency is `v_(1)`

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

As the frequency of incident wavelength increases beyond threshold frequency, kinetic energy of photoelectrons decreases.

It is impossible to obtain such a graph

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