PHYS 1201 Lecture Notes - Lecture 5: Transverse Wave, Electromagnetic Spectrum, Atomic Mass
19 Aug 2018
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Document Summary
Each photon has a wavelength and a frequency. The energy of a photon depends on its frequency. Polarization describes the direction in which a light wave is vibrating. Polarized sunglasses block light that reflects off of horizontal surfaces. Atomic mass #= # of protons + neutrons. Isotope: same number of protons but different number of protons. Ionaization: stripping away of electrons, changing atoms into plasma. Phase of subsatnce depends on temperature na dpressure. The spectrum pf a common (incandescent) light buln spans all visible wavelength, without interruption. A cloud of gas between us and a light bulb can absorb liight of specific wavelengths, leaving dark absorption lines in the spectrum. Molecules have additional energy level because they can vibrate and rotate. Nearly all large or dense objects emit thermal radiation, cindluign stars, planets, and you. Ab object"s thermal radiation spectrum depends on only one property: its temperature. Hotter objects emit more light at all frequencies per unit area.
