The unit of measurement for electric power is
A) joules per second.
B) watts.
C) both are equivalent
D) none of the above
Answer: C
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A lightbulb is connected to a 120 V(rms), 60 Hz source. How many times per second does the current reverse directions?
A. 60 B. 130 C. 120 D. 30
The principal greenhouse gases in our present atmosphere are
A) hydrogen and helium. B) hydrogen sulfide and carbon disulfide. C) water vapor and carbon dioxide. D) methane and ammonia. E) sulfuric acid vapor and carbon dioxide.
This diagram represents Earth's rotation and orbit. What do we call the flat blue plane shown in this diagram?
A) the solar plane B) the ecliptic plane C) Earth's axis D) the galactic plane E) an astronomical unit
Laser light sent through a double slit produces an interference pattern on a screen 3.00 m from the slits. If the eighth-order maximum occurs at an angle of 63.4°, at what angle does the third-order maximum occur?
a. No third-order maximum occurs. b. 0.34° c. 19.6° d. 23.8° e. Not enough information is given.