Definitions [1]
A signal of 5 kHz frequency is amplitude modulated on a carrier wave of frequency 2 MHz. The frequencies of the resultant signal are ______.
A signal of 5 kHz frequency is amplitude modulated on a carrier wave of frequency 2 MHz. The frequencies of the resultant signal are 2005 kHz, 2000 kHz and 1995 kHz.
Explanation:
Amplitude modulated wave consists of three frequencies are ωc + ωm, ω, ωc - ωm
i.e. 2005 kHz, 2000 kHz and 1995 kHz.
Key Points
Key Points:
- Electric and magnetic fields in an electromagnetic wave are perpendicular to each other.
- Both fields are perpendicular to the direction of propagation.
- Electromagnetic waves are self-sustaining oscillations in a vacuum.
- No material medium is required for their propagation.
- In a vacuum, their speed is 3 × 108 m/s.
- In a material medium, velocity is \[\frac {1}{\sqrt {με}}\].
- Radio, TV signals, and light are important examples of energy transfer by electromagnetic waves.
Concepts [3]
- Introduction to Electromagnetic Waves
- Amplitude Modulation (AM)
- Nature of Electromagnetic Waves
