Which of the following in the carrier wave remains constant in frequency modulation (FM)?
Correct answer: B. Intensity
- A. Velocity
- B. Intensity
- C. Amplitude
- D. Acceleration
Explanation
In frequency modulation (FM), the frequency of the carrier wave is varied in proportion to the amplitude of the modulating signal while the intensity remains constant. This modulation technique is used in many applications like radio broadcasting. The other options such as velocity, amplitude, and acceleration do not remain constant in FM, making them incorrect choices.
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About Electromagnetic Waves
Electromagnetic waves consist of mutually perpendicular, oscillating electric and magnetic fields that also remain perpendicular to the direction of propagation. They travel through vacuum at the speed of light and include radio waves, microwaves, infrared, visible, ultraviolet, X-rays and gamma rays. Unlike mechanical waves, they do not require a material medium.
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