Radio waves travel
A) always much faster than sound waves.
B) in common cases at the same speed as sound waves.
C) slower, on average, than sound waves.
D) at a speed that depends on frequency.
Answer: A
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A. Downloadable B. Streaming C. Royalty-free D. Plug-in
Per unit area (such as a square centimeter), a B star whose surface temperature is 10,000 K will put out how much radiation compared to an O star whose surface temperature is 30,000 K?
A) 81 times as much B) 9 times as much C) 1/81 as much D) 1/9 as much E) 1/3 as much
Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that
A. Y has a negative charge. B. Z has a negative charge. C. Y has a positive charge. D. Z is neutral (has no net charge). E. Y is negatively charged or neutral (has no net charge).
Infiltration in a house will ________
a. increase on windy days b. raise the heating load by about 10% c. reduce the number of air changes d. be increased by caulking around windows