An X-ray tube with a copper target emits ${\mathrm{CuK}}_{\mathrm{\alpha }}$ line of wavelength 1.50 $\stackrel{\mathrm{o}}{\mathrm{A}}$. What should be the minimum voltage through which electrons are to be accelerated to produce this wavelength of X rays? $\left(\mathrm{h}=6.63\times {10}^{-34}\mathrm{J}-\sec ,\mathrm{c}=3\times {10}^8\mathrm{m}/\mathrm{s}\right)$

• A

  8280 V

• B

  828 V

• C

  82800 V

• D

  8.28 V