1.

When monochromatic light of frequency f_(1) incident on photosensitive surface ,stopping potential obtained is V_(1).When same surface is incident with monochromatic light of frequency f_(2) is incident on same surface ,stopping potential will become......

Answer»

`V_(1)+(h)/(E )(f_(2)-f_(1))`
`V_(1)-(h)/(e )(f_(2)-f_(1))`
`V_(1)+(h)/(e )(f_(1)+f_(2))`
`V_(1)-(h)/(e )(f_(1)+f_(2))`

SOLUTION :`eV_(1)=hf_(1)-phi` and `eV_(2)=hf_(2)-phi_(0)`
`e(V_(2)-V_(1))=h(f_(2)-f_(1))`
`therefore V_(2)-V_(1)=(h)/(e )(f_(2)-f_(1))`
`therefore V_(2)=V_(1)+(h)/(e )+(h)/(e )(f_(2)-f_(1))`


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