Which of the following will not influence the rate at which nuclear reactions will occur in a nuclear power plant where the fuel elements are a mixture of 235U and 238U?
a. the presence of moderating material
b. the presence of control rods
c. the percentage of 235U relative to 238U
d. the percentage of the energy that is used to produce electricity
d
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A coil with a self-inductance of 6 H has a constant current of 2 A flowing through it for 2 seconds. What is the emf induced in this coil?
A) 6 V B) 12 V C) 0 V D) 4 V E) 8 V
Which of the following statements about apparent and absolute magnitudes is true?
A) A star's absolute magnitude is the apparent magnitude it would have if it were at a distance of 10 parsecs from Earth. B) The magnitude system that we use now is based on a system used by the ancient Greeks over 2,000 years ago that classified stars by how bright they appeared. C) A star with an apparent magnitude of 1 appears brighter than a star with an apparent magnitude of 2. D) The absolute magnitude of a star is another measure of its luminosity. E) All of the above are true.
During a nuclear reaction, the particles involved lose 4.8 × 10-28 kg of mass. How many joules of energy are released by this reaction? (c = 3.00 × 108 m/s)
A) 4.3 × 10-11 J B) 1.4 × 10-19 J C) 1.6 × 10-36 J D) 2.1 × 10-40 J E) 5.3 × 10-45 J
Isotopic evidence for the presence significant quantities of liquid water on Mars in the past comes from the observation of
A) an elevated ratio of deuterium to hydrogen B) an elevated ratio of hydrogen to deuterium C) a complete absence of hydrogen in the atmosphere D) a complete absence of deuterium in the atmosphere