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Solution


Q.

If the two metals A and B are exposed to radiation of wavelength 350 nm. The work functions of metals A and B are 4.8 eV and 2.2 eV. Then choose the correct option.    [2023]
1 Metal B will not emit photo-electrons  
2 Both metals A and B will emit photo-electrons  
3 Both metals A and B will not emit photo-electrons  
4 Metal A will not emit photo-electrons  

Ans.

(4)

ϕ=hcλ=1240350eV=3.54 eV

∴ Only metal B will emit photoelectron.