A) depends on the intensity of the radiation
B) depends on the nature of the metal used
C) depends both on the intensity of the radiation and the metal used
D) is the same for all metals and independent of the intensity of the radiation
Correct Answer: D
Solution :
[d] \[hv=\phi +\frac{1}{2}m{{v}^{2}}\Rightarrow hv=\phi +K.E.\] \[v=\phi +\frac{1}{h}K.E.\] This is equation of a straight line, if we plot v, K-E curve. The slope of this curve is \[\frac{1}{h}\] which is constant. So, it is independent of metals used. Option [d] is correct.
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