Which jovian planet should have the most extreme seasonal changes?
A) Uranus B) Saturn C) Neptune D) Jupiter
A
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Why do astronomers often measure the visible-light apparent brightness instead of the total apparent brightness of a star?
A) All stars put out most of their light in the visible range of the spectrum. B) In order to measure the total apparent brightness of a star, you must measure its brightness in all wavelengths, and this is difficult to do. The only wavelengths you can measure from the surface of Earth are visible and radio wavelengths. C) Most stars do not put out light in other ranges of the spectrum. D) They are identical for most stars. E) Astronomers are lazy.
An 8.000-mW laser beam emits a cylindrical beam of light 0.6000 mm in diameter. What is the maximum value of the magnetic field?
A) 9.240 × 10-6 T B) 17.22 × 10-6 T C) 12.42 × 10-6 T D) 20.50 × 10-6 T E) 15.40 × 10-6 T
Boiling and freezing can occur at the same time when water is subjected to
A) decreased temperatures. B) decreased atmospheric pressure. C) increased temperatures. D) increased atmospheric pressure.
The temperature coefficient of resistivity of platinum is 3.9 × 10-3/C°. If a platinum wire has a resistance of R at a temperature of 23°C, to what temperature must it be heated in order to double its resistance to 2R?
A) 730°C B) 280°C C) 300°C D) 930°C