The Light from a Distant Cloud of Gas and Dust

question 296

Multiple Choice

The light from a distant cloud of gas and dust looks distinctly red to the unaided eye. When a spectrum is taken, the short wavelengths are all found to be dimmed in intensity compared with the longer wavelengths, which are all more intense. Thus, the red color in this situation is due to

• A) interstellar reddening.
• B) the Balmer spectrum of hydrogen.
• C) the Doppler effect.
• D) any one of these three phenomena.

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