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(B) Modulation is the process of superimposing a low-frequency information signal onto a high-frequency carrier wave. The primary reasons for modulati

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to reduce the time lag between transmission and reception of the information signal

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(B) Modulation is the process of superimposing a low-frequency information signal onto a high-frequency carrier wave. The primary reasons for modulation are: $1$. To reduce the size of the antenna: The minimum antenna height required is $h = \lambda/4$. For low-frequency signals, $\lambda$ is very large, requiring an impractically large antenna. Modulation increases the frequency, thus decreasing $\lambda$ and the antenna size. $2$. To increase the selectivity: By using different carrier frequencies, multiple signals can be transmitted simultaneously without interference. $3$. To reduce the fractional bandwidth: The ratio of signal bandwidth to center frequency is reduced, which makes the signal easier to process and multiplex. Modulation does not reduce the time lag between transmission and reception, as the signal travels at the speed of light $(c)$ regardless of the modulation process. Therefore, option $B$ is incorrect.

Which of the following four alternatives is not correct? We need modulation:

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