Silver has a Fermi level (energy) of 5.5 eV. At 0 K, at what speed would the electrons be moving if they had kinetic energy equal to the Fermi energy?
(This speed is known as the Fermi speed.) (mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J • s)
A) 1100 km/s B) 1400 km/s C) 2.2 km/s D) 1.0 km/s E) 3.5 km/s
B
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The average braking force of a 1000-kg car moving at 10 m/s braking to a stop in 5 s is
A) 1000 N. B) 2000 N. C) 3000 N. D) 4000 N. E) 5000 N.
Humans have existed on Earth for about _____
A) 4 million years B) 5 million years C) 6 million years D) 7 million years
The darker-colored bands in Jupiter's atmosphere are ________.
A. moving downward B. lower in altitude than the lighter-colored bands C. transparent, relative to the lighter-colored bands D. warmer than the lighter-colored bands E. All of these choices are correct.
Object A has a charge q on it, object B has a charge q on it, and object C has a charge 3q on it. These charges are arranged, one each, at the vertices of an equilateral triangle. Which charge has the greatest magnitude electric force on it?
a. A b. B c. C d. All have equal magnitude forces on them. e. A and B