Fission is used in
a. atomic bombs.
b. power plants.
c. energy for stars.
d. hydrogen bombs.
e. a tokamak reactor.
a, b
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Which of the following scenarios involves energy that we would typically calculate with Einstein's formula E=mc2?
A) A small amount of the hydrogen in of a nuclear bomb becomes energy as fusion converts the hydrogen to helium. B) An object accelerated to a great speed has a lot of kinetic energy. C) A mass raised to a great height has a lot of gravitational potential energy. D) A burning piece of wood produces light and heat, therefore giving off radiative and thermal energy.
Which of the following is an assumption rather than a prediction of Einstein's special theory of relativity?
A) the constancy of the speed of light B) No material object can reach or exceed the speed of light. C) time dilation D) the equivalence of mass and energy E) length contraction
Why are several observations or trials taken for each measurement?
What was the conclusion of Feynman's first thought experiment regarding waves and particles, in which indestructible bullets are fired from a wobbly gun at a pair of slits?
a. When both slits are open, the total of bullets in this sand is the sum of bullets shot through one slit and the other. b. A bullet through one slit affects the probability that the next bullet goes through the same slit. c. Bullets rebounding from closed slits show refraction patterns. d. When both slits are open, interference patterns keep the number of bullets from reaching the full number shot one slit and then the other. e. Three times as many bullets go through two open slits as through one and then the other.