The composition of a planet's atmosphere be measured during a transit by analyzing
A) the excess absorption of starlight at specific wavelengths.
B) the excess emission of starlight at specific wavelengths.
C) the length and depth of the dip in light during the transit.
D) the amplitude and period of the star's motion.
E) the wobble in a star's position on the sky.
A
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What is the evidence for an accelerating universe?
A) White-dwarf supernovae are the same brightness regardless of redshift. B) White-dwarf supernovae are slightly brighter than expected for a coasting universe. C) White-dwarf supernovae are slightly dimmer than expected for a coasting universe. D) The Andromeda Galaxy is moving away from the Milky Way at an ever-increasing speed. E) There is far more dark matter than visible matter in the universe.
If two quarks in an anti-proton have the color anti-red and anti-blue, the third quark must have the color
a. red. b. blue. c. anti-purple. d. anti-green.
Which of the following is not a fundamental force?
a. the gravitational force b. the electromagnetic force c. the strong force d. the force of forward motion also known as the inertial force e. Choose this answer if two of the named forces are not fundamental.
A chunk of ice (T = -20°C) is added to a thermally insulated container of cold water (T = 0°C). What happens in the container?
A) The ice melts until thermal equilibrium is established. B) The water cools down until thermal equilibrium is established. C) Some of the water freezes and the chunk of ice gets larger. D) none of the above