Problem 21.13

21.13.
The formula for resistance as a function of temperature is given by
$R = R_{0} (1 + \alpha (\Delta T))$
$140 \Omega = (19 \Omega)[1 + (4.5 \times 10^{-3} /{}^{\circ}C)(\Delta T)]$
Solving for $\Delta T$ yields
$\Delta T = 1440 {}^{\circ}C$