How fast is an electron moving if it has a wavelength equal to the distance it travels in one second?

  • A
    $\sqrt{\frac{h}{m}}$
  • B
    $\sqrt{\frac{m}{h}}$
  • C
    $\sqrt{\frac{h}{p}}$
  • D
    $\sqrt{\frac{h}{2(KE)}}$

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The diffraction of an electron beam indicates that:

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