The energy of a photon of characteristic $X-$ rays from a Coolidge tube comes from

  • A
    The kinetic energy of the striking electron
  • B
    The kinetic energy of the free electrons of the target
  • C
    The kinetic energy of the ions of the target
  • D
    An electronic transition of the target atom

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

Which of the following wavelengths falls in the $X-$ray region in $\mathring{A}$?

$X$-rays were discovered by

According to Moseley's law,the frequency of a spectral line in the $X$-ray spectrum varies as:

An $X$-ray machine has an accelerating potential difference of $25,000$ volts. By calculation, the shortest wavelength will be obtained as....... $\mathring{A}$ ($h = 6.62 \times 10^{-34} \text{ J-s}$; $e = 1.6 \times 10^{-19} \text{ C}$).

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