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Gaokao Physics Practice Question

普朗克常量 $h=6.626 \times 10^{-34} \mathrm{~J} \cdot \mathrm{s}$, 光速为 $c$, 电子质量为 $\boldsymbol{m}_{e}$, 则 $\frac{h}{m_{e} c}$ 在国际单位制下的单位是

  1. A.$\mathrm{J} / \mathrm{s}$
  2. B.$\mathrm{m}$
  3. C.$\mathrm{J} \cdot \mathrm{m}$
  4. D.$\mathrm{m} / \mathrm{s}$

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