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Quantum mechanical model of the atom

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By Expert Faculty of Sri Chaitanya
Question

Photons of energy 7 eV are incident on two metals A and B with work functions 6 eV and 3 eV respectively. The minimum de-Broglie wavelengths of the emitted photoelectrons with maximum energies are λA and λB, respectively where λAλB  is equal to __________.

Moderate
Solution

KA=1eVKB=4eVKE=12mv2=12m2v2mp=2mKEλAλB=PBPA=KBKA=41=2


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