In the Doppler effect for electromagnetic waves, which of the following gives the greatest shift in frequency?
a. the source moving toward the non-moving observer at speed v
b. the observer moving toward the non-moving source at speed v
c. the source moving toward the approaching observer, both at speed v /2
d. All of the above give the same shift.
D
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How do scientists estimate the age of the universe?
A) They look up the answer in a book or they Google it. B) They measure the abundances of radioactive elements in meteorites, and use their half-lives to calculate the age of the meteorites, which are the oldest solids in the solar system. C) They measure the speeds and distances of galaxies, and calculate the time it took for them to travel that distance (away from us). D) They make a guess: no one really knows how old the universe is. E) They measure how fast the Sun is losing energy, and how much energy it has left to lose.
The prediction of special relativity that moving clocks run slow is
a. time dilation. b. length contraction. c. the equivalence of mass and energy. d. the principle of relativity. e. none of the above.
The oldest objects found so far in our solar system are Earth rocks that are 1 billion years old
a. True b. False Indicate whether the statement is true or false
As an object moves from point A to point B only two forces act on it: one force is nonconservative and does ?30 J of work, the other force is conservative and does +50 J of work. Between A and B,
a. the kinetic energy of object increases, mechanical energy decreases. b. the kinetic energy of object decreases, mechanical energy decreases. c. the kinetic energy of object decreases, mechanical energy increases. d. the kinetic energy of object increases, mechanical energy increases. e. None of the above.