The longest diameter of the Milky Way is about how many light-years?
a. 10
b. 10,000
c. 100
d. 100,000
d
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When the equilibrium concentration of vacancies is present in a crystal at constant temperature and pressure, the Gibbs free energy is at a(n) _____________.
Fill in the blank(s) with the appropriate word(s).
Which of the following are true statements about the extrasolar planets found so far?
A) Extrasolar planets have a much wider range of densities than the planets in the solar system. B) Extrasolar planets fall neatly into the terrestrial and jovian categories. C) Extrasolar planets all have nearly circular orbits. D) All of the above are correct.
A brass cube, 13.0 cm on a side, is raised in temperature by 239°C. The coefficient of volume expansion of brass is 57 × 10^?6/C°. By what percentage is any one of the 13.0-cm edges increased in length?
a. 0.34% b. 5.9% c. 0.45% d. 1.8% e. 4.3%
Light of wavelength 500 nm illuminates a round 0.50-mm-diameter hole. A screen is placed 6.0 m past the slit. What is the width of the central bright circle on the screen?
A) 3700 ?m B) 7.3 mm C) 15 mm D) 260 ?m