Question

TV waves have a wavelength range of $1-10$ meter. Their frequency range in $MHz$ is

• A. $30-300$
• B. $3-30$
• C. $300-3000$
• D. $3-3000$

Answer 1

Answer: (A)

$30-300$

$v=\frac{C}{\lambda }\Rightarrow v_1=\frac{3\times {10}^8}{1}=3\times {10}^{8}Hz=300MHz$
and $v_2=\frac{3\times {10}^8}{10}=3\times {10}^{7}Hz=30MHz$