Question

A FM channel RADIO BYJUS operates at a frequency $100\text{MHz}$, then the wavelength of signals is (speed of sound wave $=330\text{m/s}$, speed of EM wave $=3\times {10}^8\text{m/s}$)

• A. $3\text{m}$
• B. $3.3\times {10}^{-6}\text{m}$
• C. $6.6\times {10}^{-6}\text{m}$
• D. $6\text{m}$

Answer 1

The correct option is A $3\text{m}$

We know that frequency is given by
$n=\frac{c}{\lambda }$
$\lambda =\frac{c}{n}=\frac{3\times {10}^8}{1\times {10}^8}=3\text{m}$ (radiowaves are electromagnetic)