Atomic StructureHard

Question

Sodium atoms emit a spectral line with a wavelength in the yellow, 589.6 nm. What is the approximate di­fference in energy between the two energy levels involved in the emission of this spectral line?

Options

A.3.37 × 10–19 J
B.2.1 eV
C.48.35 kcal/mol
D.All of these

Solution

$\Delta E = \frac{1240}{589.6} = 2.1\text{ eV = 3.37} \times \text{1}\text{0}^{- 19}\text{ J = 48.5 kcal/mol}$

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