Evidence that the universe is expanding is provided by Hubble's Law which states that
A. the farther away a star is from us, the less its luminosity.
B. the farther away a star is from us, the less its velocity of recession.
C. the farther away a star is from us, the greater its velocity of recession.
D. the nearer to us a star is, the greater its velocity of recession.
Answer: C
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The law of reflection applies to
a. specular reflection. b. diffuse reflection. c. irregular reflection. d. all of these.
The Widmanstätten patterns found in some meteorites show that the material
a. cooled very slowly. b. cooled very rapidly. c. was never heated to the point of being molten. d. was molten just before it entered Earth's atmosphere. e. is composed primarily of organic compounds.
In a Compton scattering experiment, the scattered photon has a wavelength of 6.55 pm. If the scattering angle is 
what is the wavelength of the incident photon?
A. 5.68 pm B. 7.42 pm C. 3.28 pm D. 0.868 pm E. 2.43 pm
The mercury in a thermometer has a volume of 0.516 milliliters and a mass of 2.8 grams. What is its density?
A. 4.52 g/mL B. 5.43 g/mL C. 6.72 g/mL D. 7.31 g/mL