Which of the following is not used as a moderator material for nuclear reactors?
A)
sodium
B)
heavy water
C)
graphite
D)
boron
E)
These are all used as a moderator material for nuclear reactors.
D
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Which one of the following statements is true?
A) Desert landscapes are monotonous, relatively flat areas covered to various depths with sand B) Deserts and dry lands are concentrated in areas of ascending air masses and relatively low atmospheric pressures C) Despite infrequent rainfalls, erosional and depositional features of running water are important in desert landscapes D) Wind is the major cause of erosion in deserts because there is little water but a lot of wind available
One of the most efficient engines built so far has the following characteristics: combustion chamber temperature = 1900°C; exhaust temperature = 430°C. 7 × 109 cal of fuel produces 1.4 × 1010 J of work in one hour
(a) What is the actual efficiency of this engine? (b) What is the Carnot efficiency of this engine?
In the context of an eclipsing binary system, briefly explain a light curve
What will be an ideal response?
Energy and Momentum: If you want to double the kinetic energy of a gas molecule, by what factor must you increase its momentum?
A. 
B. 2
C. 2
D. 4
E. 16