The light-emitting diode in the circuit shown in Figure P2.64 has parameters (V_{gamma}=1.7 mathrm{~V}) and (r_{f}=0). Light

Question:

The light-emitting diode in the circuit shown in Figure P2.64 has parameters $V_{\gamma}=1.7 \mathrm{~V}$ and $r_{f}=0$. Light will first be detected when the current is $I=8 \mathrm{~mA}$. If $R=750 \Omega$, determine the value of $V_{I}$ at which light will first be detected.

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