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A and B are two metals with threshold fr...

A and B are two metals with threshold frequencies `1.8xx10^(14)Hz and 2.2xx10^(14)Hz`. Two identical photons of energy of 0.825 eV each are incident on them. Then photoelectrons are emitted in take `h=6.6xx10^(-34)J//s`

A

B alone

B

A alone

C

neither A nor B

D

both A and B

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