What is the energy of a photon of wavelength 600 nm (h = 6.626 × 10⁻³⁴ J s, c = 3.0 × 10⁸ m s⁻¹)?
Correct answer D. 3.31 × 10⁻¹⁹ J
Explanation
E = hc/λ = (6.626 × 10⁻³⁴ × 3.0 × 10⁸) ÷ (600 × 10⁻⁹ m) = 3.31 × 10⁻¹⁹ J. Forgetting to convert nm to m gives wrong answers.
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