How does the rate of cooling affect grain size?
Slow cooling produces large-sized grains. Fast cooling produces small-sized grains.
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During retrograde motion, the planet Mars rises in the west and sets in the east.
Answer the following statement true (T) or false (F)
Most SETI searches are done at:
A) X-ray wavelengths. B) infrared wavelengths. C) visual wavelengths. D) radio wavelengths. E) gamma wavelengths.
Processed meteorites with high metal content probably are
A) leftover chunks of rock from the earliest period in the formation of the solar system. B) pieces of comets rather than of asteroids. C) chunks of rock chipped off the planet Mars. D) chunks of rock chipped off the planet Mercury. E) chunks of the core of a larger asteroid that was shattered by a collision.
A stopping potential of 3.2 V is needed for radiation whose wavelength is 200 nm. What is the work function (in eV) of the material?
a. 4.0 b. 3.0 c. 5.0 d. 6.0 e. 2.0