The Sun has a surface temperature of approximately 5800 K. At what wavelength does the maximum energy radiated by the Sun occur?
a. 5800 nm
b. 300 nm
c. 174 nm
d. 500 nm
e. 3000 nm
d
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A superconductor at temperatures below the critical temperature has a magnetic susceptibility equal to _________.
Fill in the blank(s) with the appropriate word(s).
Density: The mass of Mars, 6.40 × 1023 kg, is about one-tenth that of Earth, and its radius, 3395 km, is about half that of Earth. What is the mean density (mass divided by volume) of Mars in kilograms per cubic meter?
A. 9.76 × 102 kg/m3 B. 1.95 × 103 kg/m3 C. 3.90 × 103 kg/m3 D. 7.81 × 103 kg/m3
What is thought to prevent the formation of stars with masses larger than about 300 times that of our Sun?
A) Molecular clouds do not have enough material to form such massive stars. B) Such massive stars would fragment into binary stars because of their rapid rotation. C) Such massive stars would generate so much light that radiation pressure would blow them apart. D) The onset of degeneracy pressure would prevent such massive stars from forming.
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.