Both $X$-rays and $\gamma$-rays are electromagnetic waves. Which of the following statements is true for them?

  • A
    The energy of $X$-rays is greater than that of $\gamma$-rays.
  • B
    Generally,the wavelength of $X$-rays is greater than that of $\gamma$-rays.
  • C
    The frequency of $X$-rays is greater than that of $\gamma$-rays.
  • D
    The velocity of $X$-rays is greater than that of $\gamma$-rays.

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