Dr. X believes that the Hubble constant is H0 = 55 km/s/Mpc. Dr. Y believes it is H0 = 80 km/s/Mpc. Which statement below automatically follows?
A) Dr. X believes that the universe is expanding, but Dr. Y does not.
B) Dr. X believes that the Andromeda Galaxy (a member of our Local Group) is moving away from us at a slower speed than Dr. Y believes.
C) Dr. X believes that the universe is older than Dr. Y believes.
D) Dr. X believes that the universe will someday stop expanding, while Dr. Y believes it will expand forever.
E) Dr. X believes that the universe has a much higher density than Dr. Y believes.
C
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A person watching a train going by says the train is moving 50 km/hr. A person in the train claims the train is not moving. Who is correct?
A) Both are correct in some sense, but should be more specific when describing the motion. B) The person watching the train going by. C) The person in the train. D) Both are wrong.
Carbon dioxide forms into a solid (dry ice) at approximately ?157°F. What temperature in degrees Celsius does this correspond to?
a. ?157°C b. ?93°C c. ?121°C d. ?105°C
If the only light present is yellow, what color will a blue sweater appear to be?
A. White B. Yellow C. Blue D. Green E. Black
An x-ray photon with wavelength 15.0 pm is scattered at 
by an electron. What is the wavelength of the scattered photon?
A. 31.0 pm B. 14.9 pm C. 1.57 pm D. 17.2 pm E. 12.8 pm