Maxwell in his famous equation of electromagnetism introduced the concept of
The speed of electromagnetic wave in vacuum depends upon the source of radiation. It
Speed of EM waves in vacuum =\(\frac{1}{\sqrt{\mu _{0}\epsilon _{0}}}\) = constant
The electromagnetic waves travel with a velocity
The wave impendance of free space is
Wave impedance = Z =\(\sqrt{\frac{\mu _{0}}{\varepsilon _{0}}}=376.6\Omega\)
The ozone layer absorbs radiation of wavelengths
10 cm is a wavelength corresponding to the spectrum of
Microwave region wavelength =10–3m to 1m
In an electromagnetic wave, the electric and magnetic fields are 100 V m-1 and 0.265 A m-1. The maximum energy flow is
Here, amplitude of electric field, E0= 100 V/m; amplitude of magnetic field, H0 = 0.265 A/m. We know that the maximum rate of energy flow,
S = E0 × H0 = 100 × 0.265 = 26.5 W/m2.
The frequency 2 MHz belongs to
The ionosphere
In an electromagnetic wave
