Question

An amplitude modulated voltage is expressed as

$e=10(1+0.8\cos 2000\pi t)\cos 3\times {10}^6\pi tvolt$. The depth of modulation is :

• A. $8$
• B. $0.8$
• C. $800$
• D. None of these

Answer 1

The correct option is B $0.8$

Comparing given expression with: ${\left(e\right)}_{AM}=E_c(1+m_a\cos {\omega }_{m}t)\cos {\omega }_{c}t$.

Depth of modulation $=m_a=0.8$ or $80\%$