Radio waves have wavelengths that are ________ visible wavelengths.
A. slower than
B. the same energy as
C. faster than
D. longer than
E. shorter than
Answer: D
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Two objects, A and B, are rubbed together. As a result, object A acquires an excess negative charge while object B becomes positively charged. In comparison to their masses before the charging process, you can say that
A) the mass of both objects increased. B) the mass of A increased and that of B decreased. C) the mass of A decreased and that of B increased. D) the mass of both objects decreased. E) None of the other choices is correct.
What is the characteristic color of a reflection nebula?
A. yellow B. green C. black D. red E. blue
If VA ? VB = 50 V, how much energy is stored in the 36-?F capacitor?
a. 50 mJ
b. 28 mJ
c. 13 mJ
d. 8.9 mJ
e. 17 mJ
In a composite headlight:
A. The bulb is replaceable. B. ?A cracked lens will prevent lamp operation. C. ?All of these choices. D. ?None of these choices.