Engineering Physics: Unit II: Electromagnetic Waves
Speed (velocity) of EM wave in vacuum
Electromagnetic Waves
Comparing above equations (19) and (20) with the following general wave equation propagating in x-axis
SPEED (VELOCITY) OF EM WAVE IN VACUUM Comparing above equations (19) and (20) with the following general wave equation propagating in x-axis where y - instantaneous displacement c - velocity of wave We find that the velocity (speed) of the electromagnetic wave is given by Note: Magnitude of velocity is called speed. For vacuum or free space we have μ0 = 4π × 10-7 H m-1 (henry per metre) and ε0 = 8.842 × 10-12 Fm-1 (farad per metre). substituting these values in eqn (22), we get Thus, the speed of the waves in free space is a constant and equal to 3 × 108 m/s which is identical with the velocity (speed) of light. This reveals that the light is also the electromagnetic waves. Wave Equations for plane polarized EM wave in free space and their solution The electromagnetic wave equations for 
and 
in free space are given by
Engineering Physics: Unit II: Electromagnetic Waves : Tag: : Electromagnetic Waves - Speed (velocity) of EM wave in vacuum
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Engineering Physics
PH3151 1st semester | 2021 Regulation | 1st Semester Common to all Dept 2021 Regulation