Doppler Effect: In many cartoon shows, a character runs off a cliff, realizes his predicament, and lets out a scream. He continues to scream as he falls. If the physical situation is portrayed correctly, from the vantage point of an observer at the foot of the cliff, the pitch of the scream as he falls should be
A. higher than the original pitch and constant.
B. higher than the original pitch and increasing as he falls.
C. lower than the original pitch and constant.
D. lower than the original pitch and decreasing as he falls.
E. It is impossible to predict.
Answer: B
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The emission of a line from the Balmer series is followed almost immediately by the emission of a line from the Lyman series. This will be true for
a. only the first line of the Balmer series and the first line of the Lyman series. b. all the lines of the Balmer series followed by only the first line of the Lyman series. c. only the first line of the Balmer series followed by any of the lines of the Lyman series. d. all the lines of the Balmer series followed by any of the lines of the Lyman series.
The closest star to the Sun is named
a. Polaris. b. Sirius. c. Betelgeuse. d. Proxima Centauri.
Hector drives a pickup truck horizontally at 15.0 m/s. He is transporting a crate of delicate lead crystal. If the coefficient of static friction between the crate and the truck bed is 0.300, what is the minimum stopping distance for the truck so the crate will not slide?
a. 28.7 m c. 38.3 m b. 51.0 m d. 44.4 m
In this perspective view of the solar system, the sizes of the planets are ________ relative to the sizes of their orbits.
A) exaggerated about 1,000 times B) correctly scaled C) exaggerated about 10 times D) exaggerated about 100 million times