What did the Universe used to look like?
A.) Transparent.
B.) Translucent.
C.) Colorful.
D.) Opaque.
E.) Photons.
Answer: D.) Opaque.
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Atoms in crystals are typically separated by distances of 0.10 nm. What KE must an electron have, in eV, in order to have a wavelength of 0.10 nm?
What will be an ideal response?
What evidence tells us that quasars are the centers of distant galaxies?
A) Rapid variations in quasar luminosity tell us that they must be quite small in size. B) Quasars are extremely luminous. C) All quasars have large redshifts. D) Images and spectra show quasars to be embedded at the centers of distant galaxies.
For any object orbiting the Sun, Kepler's law may be written T2 = kr3 . If T is measured in years and r in units of the Earth's distance from the Sun, then k = 1 . What, therefore, is the time (in years) for Mars to orbit the Sun if its mean radius from the Sun is 1.5 times the Earth's distance from the Sun?
a. 1.8 years b. 2.8 years c. 3.4 years d. 4.2 years
When all the colors of the rainbow can be seen in
a spectrum and no individual bright or dark lines are visible, the spectrum is called a)an emission spectrum. b)a continuous spectrum. c)a chromatic spectrum. d)an absorption spectrum.