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Solution


Q.

The work function of a photosensitive material is 4.0 eV. The longest wavelength of light that can cause photon emission from the substance is (approximately)         [2019]
1 3100 nm  
2 966 nm  
3 31 nm  
4 310 nm  

Ans.

(4)

Required wavelength of light,  

λ0=hcϕ=1240 eV nm4 eV≈310 nm