Physics

Problem

Which of the following best defines the absorptive power

a_{\lambda}

of a surface at wavelength

\lambda

? a) Fraction of the incident radiation of wavelength

\lambda

that is transmitted through the surface b) Ratio of energy emitted to energy incident at wavelength

\lambda

c) Fraction of the incident radiation of wavelength

\lambda

that is absorbed by the surface d) Fraction of the incident radiation of wavelength

\lambda

that is reflected by the surface