The axes on a Hertzsprung-Russell (H-R) diagram represent
A) luminosity and surface temperature.
B) mass and luminosity.
C) luminosity and apparent brightness.
D) mass and radius.
A) luminosity and surface temperature.
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The loudness of a sound is most closely related to its
A) speed. B) frequency. C) wavelength. D) intensity.
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.
A hurricane, in other parts of the world, is also known as
a. a cyclone. b. a willy-willy. c. a typhoon. d. all of the above.
When the standing wave pattern in a pipe is NANA, the pipe has which of the following set of properties? (N stands for node, A for antinode.)
a. It is open at both ends. b. It is closed at both ends. c. It is open at one end and closed at the other end. d. Any of the above could be true.