If the hypothesis tracing the extinction of the dinosaurs to an impact is correct, the dinosaurs died off largely because
A) of injuries suffered from direct hits of pieces of the asteroid or comet.
B) radiation from iridium in the asteroid caused the dinosaurs to die of cancer.
C) of global climate effects initiated by dust and smoke that entered the atmosphere after the impact.
D) the impact caused massive earthquakes worldwide.
C
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What kind of spectra is shown above?
a. continuous
b. blackbody
c. emission
d. absorption
How many emission lines are possible for atomic hydrogen gas with atoms excited to the n = 4 state?
A. 1 B. 2 C. 4 D. 5 E. 6
A 1.0-kg object is moving with a constant velocity 2.0 m/s toward the north. There are two forces acting on the object. One of the forces is 2.0 N north. The other force is ________
A) 1.0 N north. B) 3.0 N north. C) 2.0 N south. D) 2.0 N north. E) 0.
The intensity of radiation reaching the earth from the sun is 1 350 W/m2 . The earth's radius is 6.4 × 10^6 m. How big a force does this radiation exert on the earth? (Assume it is all absorbed.)
a. 5.8 × 10^8 N b. 1.2 × 10^9 N c. 2.3 × 10^9 N d. 4.6 × 10^9 N e. 1.7 × 10^17 N