Radiation and the Planetary Energy Balance. Electromagnetic Radiation Solar radiation warms the planet Conversion of solar energy at the surface Absorption and emission by the atmosphere The greenhouse effect Planetary energy balance. Spectrum of the sun compared with that of the earth.

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Blackbody. Radiated electromagnetic energy is the source of radiated thermal energy. Depends on wavelength Objects can emit and absorb electromagnetic energy. Emission coefficient e l Absorption coefficient a l Expect a distribution I l that depends on temperature. Kirchhoff’s Radiation.

Blackbody. A black body is an ideal system that absorbs all radiation incident on it The electromagnetic radiation emitted by a black body is called blackbody radiation. Stefan’s law. Wien’s displacement law λ max T = 2.898 x 10 -3 m.K.

Blackbody Radiation. Ultraviolet Catastrophe. Max Planck, Planck’s constant. Found an empirical formula which fit the measured blackbody curve Looked for way to derive this empirical formula. Max Karl Ernst Ludwig Planck.

Blackbody radiation. Goals: Understand properties of Black body radiation ; Radiation power, intensity and angle dependence. Summary. Radiation power mainly concentrated in an interval of

“Blackbody Radiation”. Despite what textbooks say, energy is NOT quantized in BB Rad. Action is quantized [every photon has action 2( ħ/2)]. Energy is ħ , and all values of occur at various intensities. Planck never accepted quantized light. He insisted that light was

Blackbody Radiation. Astrophysics Lesson 9. Homework. None today, module exams?. Learning Objectives. Define the term blackbody. Sketch and describe how shape of black body curves change as temperature is increased.

Blackbody Radiation. Blackbody: an object that absorbs and emits all radiations of all possible frequencies

Blackbody Radiation. Presented by Eric Tener. What is necessary to understand Blackbody Radiation?. The properties of light and the spectrum Absorbtivity, emisstivity, reflection, and trnsmittance Thermodynamics and quantum effects of electromagnetic radiation. Electro-magnetic Wave Spectrum.

Blackbody Radiation. All bodies at a temperature T emit and absorb thermal electromagnetic radiation Blackbody radiation In thermal equilibrium, the power emitted equals the power absorbed How is blackbody radiation absorbed and emitted?. Blackbody Radiation. Blackbody Radiation.