If a nuclide has a half-life of 100 s, what is the corresponding mean lifetime?
A. 100 s
B. 144 s
C. 69 s
D. 50 s
E. 75 s
B. 144 s
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What drives the motion of the tectonic plates on Earth?
A) convection cells in the mantle B) lava flows in trenches along the sea floor C) the Coriolis force D) Earth's magnetic field E) tidal forces
A surprising demonstration involves dropping an egg from a third-floor window to land on a foam-rubber pad 2 in (5 cm) thick without breaking. If a 56-gram egg falls 12 m, and the foam pad stops the egg in 6.25 ms, by how much is the pad compressed?
Why does Jupiter have several distinct cloud layers?
A) Different gases are present at different altitudes in Jupiter's atmosphere. B) Clouds form randomly, so on average there are always several layers. C) Different layers represent the various regions where the temperature is cool enough for liquid water to condense. D) Winds prevent clouds from forming at some altitudes, so we see clouds only at the other altitudes. E) Different layers represent clouds made of gases that condense at different temperatures.
The resolving power for light of 550 nm of an optical telescope with a diameter of 232 cm is
a. 0.05 arc seconds. b. 232 arc seconds. c. 2.32 arc seconds. d. 5 arc seconds. e. 11.6 arc seconds.