A nichrome wire and an aluminum wire, each with the same initial resistance, have the same change in resistance when heated separately. (rAl = 2.82 × 10^-8 W × m; aAl = 3.9 × 10^-3 / °C; rnichrome = 1.50 × 10^-6 W × m; anichrome = 0.40 × 10^-3 / °C.) The ratio of the temperature change of the nichrome wire to the temperature change of the aluminum wire is
a. 0.019.
b. 0.10.
c. 0.18.
d. 9.8.
e. 53.
D
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Bragg reflection results in a first-order maximum at 12.2°. In this case, at what angle would the second-order maximum occur?
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A right triangle has sides 5 m, 12 m, and 13 m. What is the sine of the smallest angle of this triangle?
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a. 90° c. 45° b. 135° d. 30°
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