Question

6.
If the energy of H-atom in the ground state
is-E, the velocity of photo-electron emitted
when a photon having energy E strikes a
stationary Li2+ ion in ground state, is given
by:
​

Answer 1

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• v=√2(Ep - 9E) ÷ m ←(whole root)

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The energy of the atom in a particular shell\propto Z².Hence ground state energy of Li+² ion =-3^2E_1=-9E_1

Work function of Li+² =9E

(ground level energy)

Ep= w+1/2mv²;

Ep= 9E +1/2mv² ( w = 9E)

v=√2(Ep-9E)÷m →(whole root for the equation)

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