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When a point light source, of power W, e...

When a point light source, of power `W`, emitting monochromatic light of wavelength `lambda` is kept at a distance `a` from a small photosensitive surface of work function `phi` and area `S`. Then

A

number of photons striking the surface per unit time as `W lambda S//4 pi h c a^(2)`

B

The maximum energy of the emitted photoelectrons as `( 1 //lambda) ( hc - lambda phi )`

C

the stopping potential needed to stop the most energetic emitted photoelectrons as `( e //lambda ) ( h c - lambda phi )`

D

photo - emission only if `lambda` lies in the range `0 le lambda le ( hc // phi )`

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The correct Answer is:
A,B,D
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