What is one difference between a rad and a rem?
a. A rad measures an amount of radiation and a rem measures a biological effect.
b. A rad measures a biological effect and a rem measures an amount of radiation.
c. Rem is an older term for rad.
d. One rem equals 100 rads.
e. One rad equals 100 rems.
a
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According to Edwin P. Hubble's discovery in 1929, the sizes of galaxy redshifts are:
A) proportional to the number of stars in the galaxy. B) inversely proportional to galaxy distances. C) inversely proportional to the number of stars in the galaxy. D) proportional to galaxy distances.
The Heisenberg uncertainty principle places restriction on the precision of simultaneously measuring both position and momentum. This principle can also be applied to the simultaneous measurement of two other variables, which are
a. force and color. b. energy and time interval. c. mass and charge. d. torque and frequency.
The plates of a parallel plate capacitor of capacitance 
are horizontal. Into the gap a slab of dielectric material with 
is placed, filling the bottom half of the gap between the plates. What is the resulting new capacitance?
A.
B.
C.
D.
E.
An electric iron uses 8.0 A of current and has a power rating of 1100 W. The resistance of the iron is
A. 138 Ohms. B. 17 Ohms. C. 0.0072 Ohms. D. 8800 Ohms.