Question

If a source is transmitting electromagnetic waves of frequency $8.2\times {10}^{6}Hz$ , the wavelength of electromagnetic wave transmitted from the source is:

• A. 18.8m
• B. 36.5m
• C. 42.8m
• D. 58m

Answer 1

Answer: (B)

Electromagnetic waves travel with speed of light.
The relation between frequency $(f)$ , speed $(c)$ and wavelength $(\lambda )$ is $f=\frac{c}{\lambda }$
Given, $f=8.2\times {10}^{6}Hz,$
$c=3\times {10}^{8}m/s$
$\therefore$ $\lambda =\frac{3\times {10}^8}{8.2\times {10}^6}=36.5m$