work function of sodium is 2.3 ev..calculate the threshold frequency
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Energy or work function = h × Fo, where h is plank's constant and Fo is the threshold frequency.
2.3eV = h × Fo, h=6.6×10^-34, e= 1.6×10^-19 are constant
Therfore,
Fo = 2.3×1.6×10^-19 / 6.626×10^-34 = 0.557×10^15 = 5.57×10^14 Hz
hope this will help you
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