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12th Class Physics EM Waves

  • question_answer 4)
    A plane electromagnetic wave travels invacuum along z-direction. What can you sayabout the directions of its electric andmagnetic field vectors? If the frequency ofthe wave is 30 MHz, what is its wavelength? 

    Answer:

    The electric field vector and magneticfield vector are in plane. They arenormal to each other. Using we get i.e.,  


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