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Solution


Q.

Assertion (A): Work function of aluminium is 4.2 eV. Emission of electron will not be possible if two photons each of energy 2.5 eV strike an electron of a aluminium

Reason (R): For photoelectron emission the energy of each photon should be greater than the work function of metal
1 Both A and R are true and R is the correct explanation of A  
2 Both A and R are true and R is not the correct explanation of A  
3 A is true and R is false  
4 A is false and R is true  

Ans.

(1)

Conceptual