From where does an electromagnetic wave produces ? Write about characteristics of electromagnetic wave.
Electromagnetic wave is produced when an electric charge vibrates (moves back and forth).
Characteristics of electromagnetic waves :
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Electric field and magnetic fields are perpendicular to each other and at right angles to direction of propagation of wave.
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It travels with speed of light i.e., 3 x ${{10}^{8}}$ m${{s}^{-1}}$.
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Electromagnetic energy is characterized by wavelength and frequency .