How much energy is required to move an electron from ground state of h atom to the first excited state?
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Explanation:
The second energy level is -3.4 eV. Thus it would take E2 − E1 = -3.4 eV − -13.6 eV = 10.2 eV to excite the electron from the ground state to the first excited state. If a photon has more energy than the binding energy of the electron then the photon will free the electron from the atom – ionizing it.
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