A nuclear chain reaction is possible because, for the isotopes that can participate in a chain reaction, each nucleus when fissioned
A. produces more neutrons than are required to fission one nucleus.
B. produces more energy than is required to fission one nucleus.
C. produces daughters that can also be fissioned to produce more energy.
D. produces daughters that can fuse together to make more of the same isotope.
A. produces more neutrons than are required to fission one nucleus.
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Refracting Telescope: A student wishing to build a telescope has available an eyepiece of focal length -5.0 cm. What focal length objective is needed to obtain a magnification of 10?
Fill in the blank(s) with the appropriate word(s).
The Moon always shows nearly the same face to Earth because
A) the Moon does not rotate. B) sunlight always hits the same face of the Moon. C) the Moon rotates once in the same amount of time that it takes Earth to orbit the Sun once. D) the Moon rotates once in the same amount of time that it takes the Moon to orbit Earth once.
Why are radio waves probably the most efficient way to communicate between civilizations?
A) radio waves are easy to produce and are not affected much by interstellar matter in the galaxy B) radio waves are the most penetrating of all electromagnetic radiations C) all advanced civilizations are certain to use radio waves for communication D) radio waves are the only kind of electromagnetic radiation that can carry information
Suppose you stretch a rubber band. The work you do on the rubber band is
A. positive. B. negative. C. zero.