The 3rd harmonic of a complex tone has a frequency of 1,200 Hz. The frequency of the tone is
a. 200 Hz. b. 400 Hz.
c. 600 Hz. d. none of the above.
b
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Which of the following does not provide evidence that Mars once had large amounts of liquid water on its surface?
A) the presence of what looks like dried-up riverbeds B) the presence of impact craters that appear to have formed in mud C) the vast canal system described by Percival Lowell D) the presence of minerals, dry clay, and sedimentary rock that form in water E) some very old craters that appear to have been eroded by rain
An adiabatic expansion refers to the fact that:
a. no heat is transferred between a system and its surroundings. b. the pressure remains constant. c. the temperature remains constant. d. the volume remains constant.
A ball falls to the ground from height h and bounces to height h'. Momentum is conserved in the ball-earth system
A. no matter what height h' it reaches. B. only if h' h. E. only if h' ? h.
Why do neutrons make better nuclear probes than alpha particles?
a. Neutrons are more massive than alpha particles. b. A neutron has less mass than an alpha particle. c. Neutrons are not subject to the strong force. d. Neutrons have about the same mass as a proton. e. Neutrons have no electrical charge.