The essential distinction between $X$-rays and $\gamma$-rays is that:

  • A
    $X$-rays are produced by the nucleus,while $\gamma$-rays are an atomic property.
  • B
    $X$-rays are an atomic property,while $\gamma$-rays are produced by the nucleus.
  • C
    The frequency of $\gamma$-rays is lower than that of $X$-rays.
  • D
    The velocity of $\gamma$-rays is lower than that of $X$-rays.

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