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Five elements A , B , C , D and E have w...

Five elements `A , B , C , D` and `E` have work functions `1.2 eV , 2.4 eV , 3.6 eV , 4.8 eV` and `6 eV` respectively . If light of wavelength `4000 Å` is allowed to fall on these elements , then photoelectrons are emitted by

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