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.

Question

Camron Moreno

Physics

1 August, 13:13

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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Trace Keith · Answer 1

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.