How are $X-$rays produced?

  • A
    By the rapid deceleration of high-energy electrons hitting a metal target.
  • B
    By the vibration of atoms in a crystal lattice.
  • C
    By the radioactive decay of heavy nuclei.
  • D
    By the oscillation of electric charges in an antenna.

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The minimum wavelength of $X$-rays produced in a Coolidge tube operated at a potential difference of $40 \ kV$ is ....... $\mathring{A}$.

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