For the photoelectric effect in sodium, the figure shows the plot of c – McqOptions

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1.	For the photoelectric effect in sodium, the figure shows the plot of cut-off voltage versus frequency of incident radiation. The threshold frequency is __________
A.	6.5 X 1014 Hz
B.	4.5 X 1014 Hz
C.	3 X 1014 Hz
D.	5 X 1014 Hz
Answer» D.

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