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(D) The voltage gain $A_v$ of a common emitter amplifier is defined as the ratio of the change in output voltage to the change in input voltage.$A_v =

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$720$

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(D) The voltage gain $A_v$ of a common emitter amplifier is defined as the ratio of the change in output voltage to the change in input voltage.$A_v = \frac{\Delta V_{out}}{\Delta V_{in}} = \frac{\Delta I_C 	imes R_L}{\Delta V_{BE}}$Given:Load resistance $R_L = 6  k\Omega = 6000  \Omega$Input signal voltage $\Delta V_{BE} = 15  mV = 15 	imes 10^{-3}  V$Change in collector current $\Delta I_C = 1.8  mA = 1.8 	imes 10^{-3}  A$Substituting the values into the formula:$A_v = \frac{1.8 	imes 10^{-3}  A 	imes 6000  \Omega}{15 	imes 10^{-3}  V}$$A_v = \frac{1.8 	imes 6000}{15} = \frac{10800}{15} = 720$Thus, the voltage gain of the amplifier is $720$.

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