Why does the very thin region at the top of a soap bubble sometimes appear black?
a. Because no light passes through it.
b. Because inverted light waves and non-inverted light waves reflecting from the two surfaces cancel each other.
c. Because it is too thin to reflect light.
d. Because both reflected waves are inverted or else neither is inverted.
e. Because the rest of the film creates a shadow that obscures the colors we would otherwise see.
b
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When you compress air with a tire pump, the air temperature in the tire
A) increases. B) decreases. C) remains unaffected. D) none of the above
The symbol for carbon is
a. Ca. b. Cr. c. Co. d. C.
A hollow conducting spherical shell of radius 1.50 cm carries a charge of 5.20 nC. What is the electric field at a distance of 1.20 cm from the center of the shell?
a. 
b. 
c. 
d. 0 N/C
e. 
f. 
g. 
Taking the reciprocal of a star's parallax angle in arcsec gives the star's
a. energy output in joules. b. absolute magnitude in watts. c. solar constant in watts. d. distance in parsecs.