Interference effects observed in the early 1800s were instrumental in supporting a concept of the existence of which property of light?
a. electromagnetic character
c. wave nature
b. particle nature
d. polarization
C
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Coulomb's Law: A small charged plastic ball is vertically above another charged small ball in a frictionless test tube as shown in the figure. The balls are in equilibrium a distance d apart. If the charge on each ball is doubled, the equilibrium distance between the balls in the test tube would become
A. 
d.
B. 2d.
C. 4d.
D. 8d.
E. d/4.
When two solid spheres of the same material and same radius r are in contact, the magnitude of the gravitational force each exerts on the other is directly proportional to
A. r. B. r2. C. r3. D. r4. E. r6.
What is the observational difference between Types I & II supernovae?
A: Ia's come from white dwarfs in binaries whereas II's come from dying massive stars B: I's are brighter than II's C: I's are fainter than II's D: I's are Hydrogen poor while II's are Hydrogen rich E: I's have no central remnant while II's have neutron stars
The process of transforming sediment into sedimentary rock is called
a. lithification. b. striation. c. metamorphism. d. hardening.