Verified Solution • 2025–26 Session moderate

QJEEM23Ph7dad: JEE Main 2023 Physics - Class 12 JEEM23Ph7dad Solution: Given below are two statements : Statement I : For transmitting …

Given below are two statements :

Statement I : For transmitting a signal, size of antenna ( ll ) should be comparable to wavelength of signal (at least l=λ4l=\frac{\lambda}{4} in dimension)

Statement II: In amplitude modulation, amplitude of carrier wave remains constant (unchanged).

In the light of the above statements, choose the most appropriate answer from the options given below

Multiple Choice Options

  • A Statement I is incorrect but Statement II is correct
  • B Both Statement I and Statement II are correct
  • C Both Statement I and Statement II are incorrect
  • D Statement I is correct but Statement II is incorrect

Step-by-Step Verified Solution

For transmitting a signal, antenna should have a size comparable to the wavelength of the signal i.e., at least 14 in dimension, so that the antenna properly senses the time variation of the signal.

The amplitude of the carrier wave is varied in accordance with the message signal is termed as amplitude modulation.

So, statement I is correct but statement II is incorrect.

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