An observer approaches a stationary 1000 Hz sound source at twice the speed of sound. The observer hears a frequency of
A) 2000 Hz.
B) 500 Hz.
C) 4000 Hz.
D) 1500 Hz.
E) 3000 Hz.
D
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If we were to detect radio and TV signals that had leaked out into space from another civilization, this would be an example of
A) a signal used for communication between a civilization's home world and another star system B) a signal used for communication between a civilization's home world and another planet in its own planetary system C) a signal used for local communication in the world where the intelligent beings exist D) an intentional signal beacon
Which of the following methods used to determine the mass of a cluster of galaxies does not depend on Newton's law of gravity?
A) measuring the amount of distortion caused by a gravitational lens B) measuring the temperature of X-ray gas in the intracluster medium C) measuring the orbital velocities of galaxies in the cluster D) none of the above
Recycling steel is more energy-efficient than recycling aluminum
What will be an ideal response?
One of the most remarkable discoveries by biologists over recent decades is that life can
A) survive in an astonishing variety of environments B) only exist in a very narrow range of environments C) only exist under conditions that exist on Earth D) survive in any and every environment, however harsh