Question

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according to kirchhoffs third law, when light from a blackbody having a continuous spectrum passes through a cool transparent gas, are observed in the continuous spectrum.

Explanation:

Kirchhoff's third law states that when continuous - spectrum light (from a blackbody) passes through a cool transparent gas, the gas absorbs certain wavelengths. These absorbed wavelengths correspond to the energy levels of the gas atoms/molecules. As a result, dark lines (absorption lines) appear in the continuous spectrum.

Answer:

Absorption lines