A light source of wavelength λ illuminates a metal and ejects photoelectrons with (K.E)max=1eV.
Another light source of wavelength λ3, ejects photoelectrons from same metal with (K.E)max=4eV.
Find the value of work function of the metal.
A
1eV
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B
2eV
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C
0.5eV
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D
None of these
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Solution
The correct option is C0.5eV hν=hν0+12mv2 hcλ=ω+K.E
Where, ω=work function
When the wavelength is λ, K.E=1eV ∴hcλ=ω+1...(1)
When the wavelength is λ3, K.E=4eV ∴3hcλ=ω+4...(2)
On solving equations (1) and (2) ω=0.5eV