Physics · 2019
JEE Main · 12 January 2019, Shift 2 · Q24
When a certain photosensistive surface is illuminated with monochromatic light of frequency ν, the stopping potential for the photo current is - V_0…
When a certain photosensistive surface is illuminated with monochromatic light of frequency $\displaystyle \nu$, the stopping potential for the photo current is $\displaystyle -\mathrm{V}_0 / 2$. When the surface is illuminated by monochromatic light of frequency $\displaystyle \nu / 2$, the stopping potential is $\displaystyle -\mathrm{V}_0$. The threshold frequency for photoelectric emission is :
Official answer
(4)
$\displaystyle \frac{3 \nu}{2}$
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JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.