Energy Levels: What is the wavelength of the photon emitted when an electron in a hydrogen atom which is in the initial state n = 4 jumps to the final state n = 2? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 243 nm
B. 486 nm
C. 556 nm
D. 312 nm
E. 609 nm
Answer: B
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