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

  • A
    $\gamma$-rays have a smaller wavelength than $X$-rays
  • B
    $\gamma$-rays emanate from the nucleus while $X$-rays emanate from the outer part of the atom
  • C
    $\gamma$-rays have greater ionizing power than $X$-rays
  • D
    $\gamma$-rays are more penetrating than $X$-rays

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