AST101H1 Lecture Notes - Emission Spectrum, Thermal Radiation, Chemical Element

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AST101H1 Full Course Notes
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AST101H1 Full Course Notes
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Visible light does not pass through a black wall. White light hits a white piece of paper. The prism bends different wavelengths of light by different amounts, causing the white light from the sun to spread out into a rainbow of colors. Absorption features appear as dark lines against the brighter background of the spectrum. Wavelength frequency = speed of light: the key relationship is wavelength frequency=speed of light. The speed of light through space is always the same, so when wavelength goes up (longer), frequency must go down (lower), and vice versa: the visible light with the longest wavelength is red. To remember this, think about the fact that infrared light has longer wavelength than visible light and is called infrared because it is close to red light in the spectrum. Red light is the longest wavelength visible light, and longer wavelength means lower frequency (because wavelength frequency=speed of light).

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