Question

find the wavelength of electromagnetic wave of frequency 4x10⁹Hz in free space. give its two applications.

Answer 1

$$\begin{gathered} Weknow, \\ c=\nu \times \lambda \\ wherecisvelocityoflightinfreespace \\ \nu isfrequency \\ \lambda iswavelength \\ 3\times {10}^8=4\times {10}^9\times \lambda \\ so, \\ \lambda =0.075m \end{gathered}$$


Applications-
Electromagnetic waves have wide range of wavelength.
1.Radiowaves which is part of EM waves are used in TV and FM radio.
2. Microwaves used in cooking.