Regular atoms did not show up in the universe until when?
What will be an ideal response?
A few hundred thousand years after the Big Bang, when decoupling allowed the energy to escape, and cooled off the matter until electrons could orbit protons at temperatures of less than 3000 K.
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What is a compound?
A) a group of molecules B) a molecule containing hydrogen C) a molecule containing two or more elements D) an ionized molecule E) a molecule containing carbon
If H equals 70 km/s/Mpc, then a galaxy with a radial velocity of 2100 km/s has a distance of approximately
a. 2170 Mpc. b. 2030 Mpc. c. 30 Mpc. d. 0.03 Mpc. e. 147,000 Mpc.
A beam of light of two different wavelengths enters a pane of glass 3.00 mm thick at an angle of incidence of 56°
The indices of refraction for the two different colors are 1.514 and 1.528. Because of dispersion, the colored beams, although parallel, are separated by a small distance. How far apart are they? A) 0.057 mm B) 0.0083 mm C) 0.025 mm D) 0.014 mm E) 0.0062 mm
Which of the following best defines animated GIFs?
A. A static image that one downloads from a developer for use in websites. B. A feature-length movie in web format. C. A single file that stores separate images within multiple animation frames. D. A series of files stored in a folder that create a short animation or movie.