When white wave passes by a semi-transparent solid or, Ask an Expert

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When white wave passes by a semi-transparent solid, or liquid or gas, it's spectrum have certain dark lines or bands, such spectrum is known as absorption spectrum (of the substance by which light is passed).

(i) Substances in atomic state produce line absorption spectra. Polyatomic substances such as H₂, CO₂ and KMnO₄ produce band absorption spectrum.

(ii) Absorption spectra of sodium vapor have two (yellow lines) wavelengths D1 (5890Å) and D2(5896 Å)

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