Entropy helps to explain
A) the forward motion of time.
B) the cause of a chemical reaction.
C) sunsets.
D) photosynthesis.
E) All of the above.
Answer: E
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Total Internal Reflection: During the investigation of a new type of optical fiber having an index of refraction n = 1.21, a laser beam is aimed at the flat end of a straight fiber, as shown in the figure. What is the maximum angle of incidence ?1 if the beam is not to escape from the sides of the fiber if it is surrounded by air?
A. 42.9° B. 39.8° C. 36.7° D. 33.6° E. 30.5°
Which of the following best describes the internal layering of Jupiter, from the center outward?
A) core of rock, metal, and hydrogen compounds; thick layer of metallic hydrogen; layer of liquid hydrogen; layer of gaseous hydrogen; cloud layer B) core of rock and metal; mantle of lower density rock; upper layer of gaseous hydrogen; cloud layer C) solid rock core; layer of solid metallic hydrogen; layer of pure liquid hydrogen; cloud layer D) liquid core of hydrogen compounds; liquid hydrogen layer; metallic hydrogen layer; gaseous hydrogen layer; cloud layer
An ideal gas is allowed to expand adiabatically. Assume the process is reversible. What is the change in entropy?
A. 0 B. nR ln (V2/V1) C. nR ln (T2/T1) D. kn ln (V2/V1) E. kn ln (T2/T1)
The extent of thermal escape in a planetary atmosphere is dependent
A) only on the temperature of its atmosphere B) on the temperature and molecular weight of the gases in its atmosphere C) only on the thickness of its atmosphere D) only on molecular weight of the gases in its atmosphere