Which is true about gamma rays?
A) they travel much slower than the speed of light in a vacuum.
B) they may be dark matter.
C) they have longer wavelengths than optical light.
D) they may be dark energy.
E) they are extremely high energy radiation.
Ans: E) they are extremely high energy radiation.
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Most of the mass of the Milky Way seems to exist in the form of
A) population II stars in the Halo. B) dark matter out in the Halo. C) population I stars in the disk. D) hydrogen gas in the disk and spiral arms. E) the black hole in the Galactic Center.
Water is flowing placidly in a canal at a depth of 2 cm and a width of 2 m with a velocity of 0.4 m/s. It’s a nice sunny day in Arizona near Phoenix in the summertime. Is the flow laminar or turbulent?
(A) Laminar (B) Turbulent (C) It can alternate between being laminar and turbulent (D) Insufficient information to decide
Specific Heat: A thermally isolated system is made up of a hot piece of aluminum and a cold piece of copper, with the aluminum and the copper in thermal contact. The specific heat capacity of aluminum is more than double that of copper. Which object experiences the greater magnitude gain or loss of heat during the time the system takes to reach thermal equilibrium?
A. the aluminum B. the copper C. Neither one; both of them experience the same size gain or loss of heat. D. It is impossible to tell without knowing the masses. E. It is impossible to tell without knowing the volumes.
Two nuclei may have equal Z, but different A, because they contain
a. equal numbers of protons and neutrons. b. equal numbers of protons but different numbers of neutrons. c. different numbers of protons but equal numbers of neutrons. d. different numbers of protons and neutrons. e. electrons as well as neutrons.