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Lecture 11

ASTRONOMY LECTURE 11

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Department
Astronomy
Course
ASTR 100
Professor
Govindrajan
Semester
Fall

Description
ASTRONOMY LECTURE 11 9/20/13 Blackbody Radiation 1. 1850­1910 Physicists discovered  a. Hot objects emit continuous spectra with a so­called blackbody spectral  distribution i. Blackbody how an object radiates ii. Intensity­ how bright an object is 1. Y axis iii. Wavelength x axis iv. Higher the temperat8re of a blackbody, the shorter the wavelength  (in Nanometers) of maximum emission v. Higher the temp of blackbody curve the more light it emits at all  wavelengths b. Peak Wavelength depends on temperature i. Wien’s Law lambda max= constant (0.0029 m/ k) / T (temp in  kelvin) 1. Lambda= frequency c. Energy emitted per unit area depends on temperature i. Stefan­ Boltzmann Law
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