A siren emitting sound of frequency 1000 Hz approaches a stationary observer at one-half the speed of sound. The observer hears a frequency of
A) 1000 Hz
B) 2000 Hz.
C) 500 Hz.
D) 1500 Hz.
E) none of the above.
B
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Simple molecules containing only carbon and hydrogen are referred to as
A) carbon hydrides B) hydrocarbons C) carbohydrides D) hydrogen carbides
Consider the person described in problem N3T.6. The person’s trajectory will look most like which of the following? (The dot shows the person’s position at t = 0 and east is to the right and north to the top.)
A. A
B. B
C. C
D. D
E. E
F. F
Most of the halo stars are very old
Indicate whether the statement is true or false
What evidence tells us that quasars are the centers of distant galaxies?
A) Rapid variations in quasar luminosity tell us that they must be quite small in size. B) Quasars are extremely luminous. C) All quasars have large redshifts. D) Images and spectra show quasars to be embedded at the centers of distant galaxies.