Question
Physics Question on Electromagnetic waves
Amplitude modulated wave is represented by VAM = 10[1 + 0.4 cos(2π × 104t] cos(2π × 107t). The total bandwidth of the amplitude modulated wave is :
A
10 kHz
B
20 MHz
C
20 kHz
D
10 MHz
Answer
20 kHz
Explanation
Solution
The correct answer is (C) : 20 kHz
Bandwidth = 2 × fm
= 2 × 104 Hz
= 20 kHz