The predominant gas in the atmosphere of Mars is
A) oxygen.
B) nitrogen.
C) water vapor.
D) carbon dioxide.
E) methane.
Answer: D
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A Doppler weather radar operates at a frequency of 3.40 GHz. The wave from this radar system reflects from an approaching weather system moving with a speed of 39.0 m/s. What is the difference in frequency between the outgoing and returning waves?
A) 442 Hz B) 351 Hz C) 419 Hz D) 322 Hz E) 670 Hz
If you see Polaris directly overhead at midnight, you must be at
A) the South Pole. B) the North Pole. C) the equator. D) the Tropic of Cancer.
Radioactive Decay: The half-life of radon-222 is 3.83 d. If a sample of radon initially contains 6.00 × 108 radon atoms, how many of them are left after 10.0 d?
A. 9.82 × 107 B. 7.67 × 107 C. 8.34 × 108 D. 7.29 × 108 E. 8.56 × 108
The solar wind is created in the Sun's ________.
A. corona B. convection zone C. radiation zone D. core