MCQ

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

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