The critical temperature above which pair production can occur is called the:
A) Chandrasekhar Limit.
B) Cosmological Constant.
C) fusion temperature.
D) threshold temperature.
E) event horizon.
D
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Thermal Expansion: Suppose that a rigid aluminum wire were to be strung out in a loop that just fits snugly around the equator (assuming a perfectly spherical Earth with a radius of 6.37 × 106 m). If the temperature of the wire is increased by 0.50°C, and the increase in length is distributed equally over the entire length, how far off the ground will the wire loop be if it remained centered on the earth? The coefficient of linear expansion of aluminum is 24 × 10-6 K-1.
A. 7.6 mm B. 76 mm C. 76 cm D. 76 m E. 760 m
Which of the following would be the best radiator of thermal energy?
A) a shiny surface B) a perfectly white surface C) a perfectly black surface D) a metallic surface E) styrofoam
The boundary between two air masses is called a
a. division. b. border. c. front. d. storm.
What is the power factor for a series ac circuit containing a 50-? resistor, a 10-?F capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?
A) 0.00 B) 0.46 C) 1.0 D) 0.79