Q. A carrier is simultaneously modulated by two sine waves having modulation indices of 0.3 and 0.4. The total modulation index will be
A) 0.1
B) 0.5
C) 0.7
D) 0.35
Explanation
(b) Here, $m_{1} = 0.3\ and\ m_{2} = 0.4$
$m = \sqrt{m_{1}^{2} + m_{2}^{2}} = \sqrt{{0.3}^{2} + {0.4}^{2}}$
$= \sqrt{0.09 + 0.16} = \sqrt{0.25} = 0.5$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.