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Assertion (A) : In amplitude modulation technique the modulation index should be close to 1.
Reason (R) : The power carried by message signal in the side bands increases with increase in modulation index.

  • A.Both (A) and (R) are correct and (R) is correct explanation of (A).
  • B.Both (A) and (R) are correct, but (R) is not correct explanation of (A).
  • C.(A) is true, but (R) is false.
  • D.(A) is false, but (R) is true.

Answer: A

Both statements are true and the Reason explains the Assertion. In AM the message power sits in the sidebands, and with modulation index m the sideband power is a fraction \(\frac{m^{2}}{2+m^{2}}\) of the total, so it grows as m rises. A modulation index close to 1 puts the most power into the sidebands, the part that carries the information, without overmodulation.

That is the reason for keeping m near 1, so the Reason explains the Assertion.

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