Determine
(a) For copper, determine the energies at which the probability of electron
occupation is 0.9 and 0.1 at 300 K.
(b) Are these energies symmetric about the Fermi
energy of 7.04 eV?
The probability of a free electron occupying an energy level is given by the Fermi-Dirac statistical distribution.
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Acceleration: A racing car accelerates uniformly from rest along a straight track. This track has markers spaced at equal distances along it from the start, as shown in the figure. The car reaches a speed of 140 km/h as it passes marker 2. 
Where on the track was the car when it was traveling at half this speed, that is at 70 km/h?
A. Before marker 1 B. At marker 1 C. Between marker 1 and marker 2
The physical disintegration or fracturing of rock is called ______________
Fill in the blank(s) with correct word
The "triple point" of a substance is that point for which the temperature and pressure are such that:
A. only solid and liquid are in equilibrium B. only liquid and vapor are in equilibrium C. only solid and vapor are in equilibrium D. solid, liquid, and vapor are all in equilibrium E. the temperature, pressure and density are all numerically equal
The length of a certain wire is doubled and at the same time its radius is reduced by a factor of 2. What is the change in the resistance of this wire?
A) It is doubled. B) It is quadrupled. C) It increases by a factor of 6. D) It increases by a factor of 8. E) It is reduced by a factor of 2.