Decide whether each of these statements is True (T) or False
Copper has a linear coefficient of expansion of 0.000 017 /K and aluminium a linear coefficient of expansion of 0.000 023 /K.
(i) With equal length copper and aluminium wires exposed to the same increase in temperature, the aluminium will increase in length more than the copper.
(ii) To give the same increase in length for copper and aluminium wires for the same increase in temperature, the copper wire will need to be 1.35 time
A) (i) T (ii) T
B) (i) T (ii) F
C) (i) F (ii) T
D) (i) F (ii) F

Question

Quizplus · Accepted Answer

(i) True: Aluminium has a higher coefficient of expansion than copper, so it will expand more with the same temperature increase.  (ii) True: To achieve the same increase in length, the copper wire must be longer initially because it has a lower coefficient of expansion. The ratio of the coefficients (0.000 023 / 0.000 017) is approximately 1.35.

Decide Whether Each of These Statements Is True (T) or False