Hydrogen atom does not emit $X$-rays because

  • A
    Its energy levels are too close to each other
  • B
    Its energy levels are too apart
  • C
    It is too small in size
  • D
    It has a single electron

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In $X$-ray spectrum,the wavelength $\lambda$ of the $K_{\alpha}$ line depends on the atomic number $Z$ as:

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