9. Continued from question 8, the energy of the nth stationary state is Eₙ = -(13.6 eV)/n². When the electron goes from n = 2 state to n = 1 state, what is the wavelength of the emitted photon? (elementary charge e = 1.6 × 10⁻¹⁹ coul, Planck's constant h = 6.626 × 10⁻³⁴ J-sec)
(A) 122 nm
(B) 136 nm
(C) 147 nm
(D) 159 nm
(E) 170 nm

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