hce[1/λ₃+1/2λ₂-1/λ₁]
hce[1/λ₃+1/2λ₂-1/λ₁]
hce[1/λ₃-1/λ₂-1/λ₁]
hce[1/λ₃+1/λ₂-1/λ₁]
Stopping potential is given by
Vo=hc/λ-φ
where
h:Planck's constant,
c:speed of light,
λ:wavelength,
φ:work function
Hence,eV=hc/λ₁-φ.. (i)
3eV=hc/λ₂-φ.. (ii)
From (i) and (ii),
φ=3hc/2eλ₁-hc/2eλ₂ (iii)
When photons of wavelength λ₃ is incident, stopping potential is equal to
eV'=hc/λ₃-φ (iv)
From (iii) and (iv),
V'=hc/eλ₃+hc/2eλ₂-3hc/2eλ₁