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An excited He⁺ ion emits two photons in succession, with wavelengths 108.5 nm and 30.4 nm, in making a transition to ground state. The quantum number n, corresponding to its initial excited state is (for photon of wavelength λ, energy E = 1240 eV/λ(in nm) :)(A) n = 4 (B) n = 6(C) n = 5 (D) n = 7 |
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