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.
- CThe frequency of $\gamma$-rays is lower than that of $X$-rays.
- DThe velocity of $\gamma$-rays is lower than that of $X$-rays.
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