A critical difference between millisecond and normal pulsars is that:
A) the millisecond ones are not associated with the galaxy, but scattered everywhere.
B) the millisecond ones are speeding up, but normal pulsars slow down over time.
C) the millisecond ones must eventually collapse into black holes.
D) the millisecond ones all have planets, while normal ones do not.
E) millisecond ones are only found in globular clusters, while normal ones are not.
B
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The energy attributed to an object by virtue of its motion is known as
A) kinetic energy. B) potential energy. C) radiative energy. D) mass-energy.
Ultraviolet light is shone on a piece of metal that has a known work function, and electrons are observed being produced through the interaction of the light with the metal. The lamp that produces the light is now replaced with a lamp of the same intensity, but which produces photons having a longer wavelength. What difference is observed in the number of electrons produced per unit time?
A. The same number are produced. B. More are produced. C. Without knowing more about the wavelengths used, one cannot answer. D. Fewer are produced.
Which of the following correctly lists the terrestrial worlds in order from the most atmospheric gas to the least? (Mercury and the Moon are listed together since their atmospheres have very similar amounts of gas.)
A) Venus, Earth, Mars, Mercury/Moon B) Earth, Venus, Mars, Mercury/Moon C) Mars, Venus, Earth, Mercury/Moon D) Venus, Mars, Mercury/Moon, Earth
Which statement below correctly describes the relationship between expansion rate and age for the universe?
A) the faster the rate of expansion, the younger the age of the universe B) the faster the rate of expansion, the older the age of the universe C) Age is independent of the expansion rate.