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(C) The modulation index $m$ is defined as the ratio of the difference and the sum of the maximum and minimum amplitudes of the modulated wave.Formula

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$0.6$

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(C) The modulation index $m$ is defined as the ratio of the difference and the sum of the maximum and minimum amplitudes of the modulated wave.Formula: $m = \frac{E_{\max} - E_{\min}}{E_{\max} + E_{\min}}$Given: $E_{\max} = 16 \,V$ and $E_{\min} = 4 \,V$Substituting the values into the formula:$m = \frac{16 - 4}{16 + 4}$$m = \frac{12}{20}$$m = \frac{3}{5} = 0.6$Therefore, the modulation index is $0.6$.

The maximum amplitude of an amplitude modulated wave is $16 \,V$, while the minimum amplitude is $4 \,V$. The modulation index is

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