Using the Rydberg formula, what is the wavelength of the first Balmer line (n = 3 to n = 2) (R = 1.097 × 10⁷ m⁻¹)?
Correct answer D. 656 nm
Explanation
1/λ = R(1/2² − 1/3²) = R × 5/36. λ = 36/(5 × 1.097 × 10⁷) = 6.56 × 10⁻⁷ m ≈ 656 nm.
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