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To excite the spectral line of wavelengt...

To excite the spectral line of wavelength 4960 Å of an atom, an excitation energy of 7.7 eV is required. The ground state energy of the atom is 10.5 eV.
The energies of two levels involved in the emission of 4960 Å line are :( Assume hc = 1240 eV -nm , where h is planck's constant and c is speed of light . )

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