What is interstellar reddening?
A) Interstellar dust absorbs more red light than blue light, making stars appear redder than their true color.
B) Interstellar dust absorbs more red light than blue light, making stars appear bluer than their true color.
C) Interstellar dust absorbs more blue light than red light, making stars appear redder than their true color.
D) Interstellar dust absorbs more blue light than red light, making stars appear bluer than their true color.
E) The spectral line shift due to a star's motion through the interstellar medium.
C
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One of the absorption lines of hydrogen has a rest wavelength of 656 nm. Suppose you observe this line in four different stars, and find this line at the wavelengths show below. Which wavelength represents the star that is moving toward Earth the fastest?
A) 630 nm B) 656 nm C) 670 nm D) 640 nm
Twelve seconds after starting from rest, a freely-falling cantelope has a speed of
A) 10 m/s. B) 50 m/s. C) 100 m/s. D) more than 100 m/s.
If the layering of the close-packed planes in a FCC metal is ABCABCACABC, this is a _____________.
Fill in the blank(s) with the appropriate word(s).
Purchasing a products, following the company's social media accounts, sharing and article, or signing up for an account are examples of a(n) ______.
A. RWD B. SEO C. ROI D. CTA