Which of the following best defines the absorptive power of a surface at wavelength ?

PHYSICS · Single correct · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

Which of the following best defines the absorptive power aλa_{\lambda} of a surface at wavelength λ\lambda? (a) Fraction of the incident radiation of wavelength λ\lambda that is transmitted through the surface (b) Ratio of energy emitted to energy incident at wavelength λ\lambda (c) Fraction of the incident radiation of wavelength λ\lambda that is absorbed by the surface (d) Fraction of the incident radiation of wavelength λ\lambda that is reflected by the surface

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