The circuit shown in Figure P10.9 is used to switch a relay that turns a light off and on under the control of a computer. The relay dissipates 0.5 W at 5 VDC . It switches on at 3 VDC and off at 1.0 VDC . What is the maximum frequency with which the light can be switched? The inductance of the relay is 5 mH , and the transistor saturates at $0.2 \mathrm{~V}, V_\gamma=0.8 \mathrm{~V}$.
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