JEE Main202331 Jan 2023Evening ShiftPhysicsCommunication SystemActual
Given below are two statements Statement I : For transmitting a signal, size of antenna ( l ) should be comparable to wavelength of signal (at least l = λ 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
Options
- ABoth Statement I and Statement II are correct
- BBoth Statement I and Statement II are incorrect
- CStatement I is incorrect but Statement II is correct
- DStatement I is correct but Statement II is incorrect
Correct answer
D. Statement I is correct but Statement II is incorrect
Step-by-step solution
In amplitude modulation frequency of carrier wave remains unchanged. Minimum size of antenna should be 1 4 th of wavelength so that the antenna can sense the variations of the signal properly.