What is the ratio of the energy of a 400 nm photon to that of a 600 nm photon?
Correct answer A. 1.5
Explanation
Since E = hc/λ, energy is inversely proportional to wavelength, so E₄₀₀/E₆₀₀ = 600/400 = 1.5. The value 0.67 comes from wrongly taking E ∝ λ.
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