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Question

When a point light source, of power W emitting light of wavelength λ is kept at a distance a from a photosensitive surface of work function ϕ and area S, we will have

A
No. Of photons striking the surface per unit time as Wλ S4πhca2
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B
The maximum energy of the emitted photoelectrons as 1λ(hcλϕ)
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C
The stopping potential needed is eλ(hcλϕ) for most energetic emitted photoelectrons.
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D
Photoemission occurs only for range, 0λhcϕ
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Solution

The correct options are
A No. Of photons striking the surface per unit time as Wλ S4πhca2
B The maximum energy of the emitted photoelectrons as 1λ(hcλϕ)
D Photoemission occurs only for range, 0λhcϕ
No. Of photons released per unit time, Whcλ.
The maximum energy of emitted photo electrons is,
Emax=hvϕ=hcλϕ=1λ(hcλϕ),eVS=Emax
Hence VS=1eEmax=1eλ[hcλϕ]

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