The temperature coefficient of resistivity of iron is 5.0 10-3 / C; that of carbon is -0.50 10-3 / C. When an iron wire and a carbon rod, each having the same 10 W resistance at 20C, are cooled from that temperature to -80C, the new ratio of the resistance of the carbon rod to the resistance of the iron wire at the lower temperature is
a. -0.10.
b. +1.9.
c. +2.1.
d. -10.
e. +10.
Question 2
If a mile of 24-gauge copper wire has a resistance of 0.14 kW and the resistivity of copper is 1.7 10-8 W m, what is the diameter of the wire? (1 mile = 1.6 km)
a. 0.40 mm
b. 0.50 mm
c. 0.63 mm
d. 0.80 mm
e. 0.25 mm
The relationship between air temperature and two measures of water vapour saturation of air.
Use of the tympanic thermometer to measure body temperature.
The Carbon Cycle
Adiabatic Temperature Changes
Hydration of a Carbon–Carbon Double Bond
Controls of Temperature