A particular transistor is rated for a maximum power dissipation of \(60 \mathrm{~W}\) if the case temperature is at \(25^{\circ} \mathrm{C}\). Above \(25^{\circ} \mathrm{C}\), the allowed power dissipation is reduced by \(0.5 \mathrm{~W} /{ }^{\circ} \mathrm{C}\).

(a) Sketch the power derating curve.

(b) What is the maximum allowed junction temperature?

(c) What is the value of \(\theta_{\text {dev-case }}\) ?