The electrical resistivity of pure copper metal at 0°C is 1.6×10-8 ??m. An alloy of 1.12 atom % nickel, which is substitutional in copper, produced with this copper has an electrical resistivity at 0°C of 3×10-8 ??m. What is the electrical resistivity of an alloy produced from this copper with 3.32 atom % nickel at 0°C?
What will be an ideal response?
The resistivity of a substitutional solid solution is directly proportional to the
concentration of substitutional atoms. Using the equation that ?0 = AcNi where ?0 is the resistivity contribution due to zero dimensional defects, A is a constant to be determined and Ni c is the concentration of substitutional Ni atoms.
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Which of the patterns shown below would appear on a screen when monochromatic light first passes through a narrow slit for which a = ? and then strikes the screen? Note that the darkest area in each illustration represents the brightest area on the screen
a.
b.
Particle A (mass = m, charge = Q) and B (mass = m, charge = 5 Q) are released from rest with the distance between them equal to 1.0 m. If Q = 12 ?C, what is the kinetic energy of particle B at the instant when the particles are 3.0 m apart?
a. 8.6 J b. 3.8 J c. 6.0 J d. 2.2 J e. 4.3 J
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The modern theory of dark energy arises from observations showing that
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