You want to have an electron in an energy level where its speed is no more than 66 m/s
What is the length of the smallest box (an infinite well) in which you can do this? (h = 6.626 × 10-34 J ? s,
mel = 9.11 × 10-31 kg)
A) 5.5 µm
B) 11 µm
C) 2.8 µm
D) 1.4 µm
A
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The data points in this diagram represent the measured speeds and distances of various galaxies, and the solid line represents a best fit to these data. The trend indicated by the solid line is known as
A) Hubble's law. B) Leavitt's law. C) the inverse square law for light. D) Kepler's third law.
The Ptolemaic model of the universe
A) explained and predicted the motions of the planets with deferents and epicycles. B) is the basis of our modern cosmology. C) could not account for the stellar parallax observed by Hipparchus. D) describes the orbits of the planets as being ellipses, not circles. E) always kept Mars and Mercury between the Earth and Sun.
The metamorphism of coal to anthracite occurs due to
A) high pressure and high temperature. B) high temperatures. C) contact metamorphism. D) crystallization of organic matter.
Our current Gregorian calendar usually has a leap year every 4 years, but there are exceptions in some century years (e.g., 2100 will not be a leap year). Which of the following best explains why the calendar needs these exceptions?
A) The length of the tropical year (from one March equinox to the next) is not exactly 365-1/4 days. B) Precession of Earth's axis makes the tropical year (from one March equinox to the next) slightly different from the sidereal year (Earth's actual orbital period). C) Earth's orbital period around the Sun is gradually changing due to tidal forces. D) The exceptions are necessary to account for the difference between a solar and sidereal day.