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04-07-2018
Physics

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Dust reddens starlight because it a. emits mostly in the infrared due to its cold temperature. b. re-emits the light it absorbs at red wavelengths. c. preferentially affects light at visible and shorter wavelengths. d. is made mostly of hydrogen, which produces the red h-alpha emission line. e. primarily moves away from earth.

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krisha2018 krisha2018

16-07-2018

c. preferentially affects light at visible and shorter wavelengths.

Dust conversely affects light at optical and shorter wavelength scattering it. It scatters high-frequency light. A few percent of interstellar dust particles is responsible for markedly dimming and reddening the starlight.

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