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What is an electromagnetic wave ?...

What is an electromagnetic wave ?

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Electromagnetic waves are periodically changing electric and magnetic fields, which propagate through the space. The electric and magnetic field vectors are at right angles to each other and at right angles to the direction of propagation.
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Knowledge Check

  • Which one of the following is not an electromagnetic wave ?

    A
    X - rays
    B
    ` gamma` - rays
    C
    U-V rays
    D
    ` beta ` - rays
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