12th Class Physics Sample Paper Physics Sample Paper-8

  • question_answer
    Give two characteristics of electromagnetic waves. Write the expression for velocity of electromagnetic waves in terms of permittivity and permeability of the medium.


    Characteristics of Electromagnetic Waves
    (i) Electromagnetic waves travel in free space with speed of light, \[c=3\times {{10}^{8}}m/s\]
    (ii) Electromagnetic waves are transverse in nature.
    Expression for velocity of EM waves in vacuum, \[c=1/\sqrt{{{\mu }_{0}}{{\varepsilon }_{0}}}.\]

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