When ultraviolet light reflects from a violet surface, we see
A. red.
B. black.
C. violet.
D. white.
Answer: B
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A person jogs toward a plane mirror at a speed of 3 m/s. How fast is he approaching his image in the mirror?
A) 1 5 m/s B) 3 m/s C) 4 m/s D) 5 m/s E) 6 m/s
Olbers's paradox is an apparently simple question, but its resolution suggests that the universe is finite in age. What is the question?
A) Why is the sky dark at night? B) What would it be like to ride on a beam of light? C) How many stars are in the universe? D) Can we measure the position and momentum of an electron at the same time?
When an atom is in a magnetic field, the electron energy levels remain unaltered because the atom is limited to a single wavelength
Indicate whether the statement is true or false
Suppose two neutron stars or two black holes are closely orbiting one another. What do scientists predict will eventually happen to them, and why?
A) Their orbits will spiral inward until the two objects merge because of energy lost through gravitational waves. B) Their orbits will gradually grow larger because of the centrifugal force involved as they circle around each other. C) Their orbits will spiral inward as a result of friction with the surrounding gas until all the gas clears, after which their orbits will remain stable. D) The orbits would remain stable unless there were a third object orbiting along with them.