The slowing of clocks in strongly curved space time is known as
a. gravitational radiation.
b. time dilation.
c. gravitational curvature.
d. gravitational red shift.
e. hyperspace drag.
B
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Your first airless world! (The life-support belt seems somewhat out of adjustment, so you constantly feel as if you're going to explode)
Because of the lack of atmosphere, you must be very careful not to look at the Sun so that you will not be blinded by the ultraviolet and X-ray radiation; however, you are able to determine that the Sun has about the same angular size that you are used to on Earth. Also, because there is no air, you notice that the shadows are completely pitch-dark and there are no sounds at all. Although this world is clearly lifeless, you are surprised to find footprints and car tracks etched in the surface.
The Eiffel tower in Paris is made primarily of iron, whose coefficient of linear expansion is about 10 × 10^?6/°C. On a cold day when the temperature is –10°C the Eiffel tower is 300 meters tall. Its height on a hot day when the temperature is 40°C is
a. 300.0015 m. b. 300.015 m. c. 300.15 m. d. 301.5 m. e. 315 m.
If a 1H nucleus, a 2H nucleus, and a 3H nucleus all had the same momentum, which one has the lowest de Broglie wavelength?
a. 3H b. 2H c. 1H d. All three have the same de Broglie wavelength.
Earth is made mostly of metals and rocks. Where did most of the elements that make up these materials (carbon, silicon, iron, etc.) form?
A) They were produced by the Big Bang. B) They were produced by chemical reactions in interstellar gas clouds. C) They were produced by stars. D) They were produced in our Sun. E) They were produced by nuclear fission of uranium and other radioactive materials in space.