How do we know that chlorine caused the ozone hole?
A) From measurements of the relationship between the experimental release of chlorine from the land surface in Antarctica, and the depletion of ozone that appeared in the atmosphere a few days later.
B) From laboratory experiments involving a replica of the atmosphere over Antarctica.
C) From the relationship between the release of chlorine by the Pinatubo volcano and the depletion of ozone over Antarctica a few months later.
D) From theories of the chemical destruction of ozone, coupled with computer calculations.
E) From measurements of chlorine monoxide and ozone in the Antarctic atmosphere as the sun reappeared in the spring.
E
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The number of molecules in a container is quadrupled and the Kelvin temperature quadrupled. The volume remains unchanged. The new pressure will be how many times greater than the original pressure?
a. 16 b. 1 c. 20 d. 32
Alphonse moves eastward in a car at 30 m/s. Velma, moving eastward in a train at 70 m/s, passes him. Alphonse's velocity relative to Velma is
A) 40 m/s westward. B) 100 m/s eastward. C) 40 m/s eastward. D) 30 m/s westward. E) 100 m/s westward.
What is galactic cannibalism?
What will be an ideal response?
Star A has a temperature 1/2 that of star B, but star A is 5 times bigger than star B. Which statement below is correct?
A) Star A is redder and dimmer than star B. B) Star A is bluer and dimmer than star B. C) Star A is redder and brighter than star B. D) Star A is bluer and brighter than star B. E) Star A and star B have the same color, but star A is brighter.