Light as Evidence flashcards

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What is meant by “Electromagnetic radiation” in this lesson?Electromagnetic Radiation: Electromagnetic radiation carries energy through waves and photons across a range of wavelengths.
What is meant by “Wavelength” in this lesson?Electromagnetic Radiation: Wavelength is the spatial interval between corresponding points in a wave.
What is meant by “Frequency” in this lesson?Electromagnetic Radiation: Frequency is the number of wave cycles per unit time.
What is meant by “Photon energy” in this lesson?Electromagnetic Radiation: Photon energy is proportional to frequency.
What is meant by “Electromagnetic spectrum” in this lesson?Electromagnetic Radiation: The spectrum ranges from radio through gamma radiation.
What is meant by “Thermal spectrum” in this lesson?Electromagnetic Radiation: A thermal spectrum's distribution relates to emitter temperature under the relevant approximation.
What is meant by “Emission line” in this lesson?Spectroscopy and Motion: An emission line is enhanced radiation at a wavelength associated with a transition.
What is meant by “Absorption line” in this lesson?Spectroscopy and Motion: An absorption line reduces intensity at a wavelength where material absorbs radiation.
What is meant by “Spectral identification” in this lesson?Spectroscopy and Motion: Identification compares measured patterns with known atomic or molecular transitions.
What is meant by “Doppler shift” in this lesson?Spectroscopy and Motion: A Doppler shift changes observed wavelength through relative motion along the line of sight.
What is meant by “Radial velocity” in this lesson?Spectroscopy and Motion: Radial velocity is velocity along the observer's line of sight.
What is meant by “Spectral limitation” in this lesson?Spectroscopy and Motion: A limitation describes ambiguities and conditions affecting interpretation.
What is meant by “Luminosity” in this lesson?Luminosity, Flux, and Brightness: Luminosity is total emitted energy per unit time.
What is meant by “Flux” in this lesson?Luminosity, Flux, and Brightness: Flux is received energy per unit area per unit time under the stated measurement.
What is meant by “Inverse-square relation” in this lesson?Luminosity, Flux, and Brightness: For an unobscured isotropic source in the simple geometry, flux decreases with distance squared.
What is meant by “Apparent magnitude” in this lesson?Luminosity, Flux, and Brightness: Apparent magnitude is a logarithmic brightness measure with lower values indicating greater brightness.
What is meant by “Absolute magnitude” in this lesson?Luminosity, Flux, and Brightness: Absolute magnitude describes the magnitude at a defined reference distance and band.
What is meant by “Extinction” in this lesson?Luminosity, Flux, and Brightness: Extinction dims radiation through absorption or scattering by intervening material.