Fuel rods in a nuclear reactor contain only about 3% uranium-235 and the remainder is mostly uranium-238 . As the uranium-238 absorbs a neutron during reactions, it becomes __________, which undergoes two beta decays to become __________
a. uranium-239 b. uranium-237
c. plutonium-239 d. plutonium-238
a, c
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The index of refraction of a substance is
a)equal to the speed of light in vacuum divided by its speed in that substance. b)equal to the speed of light in that substance. c)the same as the angle of refraction. d)the same as the angle of incidence. ? ? ?
A solenoid with 568 turns, 0.19 m long, carrying a current of 3.5 A and with a radius of 10?2 m will have what strength magnetic field at its center? (magnetic permeability in empty space µ0 = 4? × 10^?7 T?m/A)
a. 1.2E–1 T b. 3.3E–3 T c. 2.5E–3 T d. 1.3E–2 T e. 4.1E–2 T
A nearsighted person cannot see objects beyond 80 cm from his eyes. Which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable him to see the distant objects clearly?
A) +80 cm, +1.3 diopters B) -80 cm, +1.3 diopters C) +80 cm, -1.3 diopters D) -80 cm, -1.3 diopters E) -1.3 cm, +1.3 diopters
The erosion process begins with
a)permafrost. b)meandering. c)landslides. d)weathering.