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Gaokao Physics Practice Question

$_{92}^{235} \mathrm{U}$ 经过 $\mathrm{m}$ 次 $\alpha$ 衰变和 $n$ 次 $\beta$ 衰变 $_{82}^{207} \mathrm{~Pb}$, 则

  1. A.$m=7, n=3$
  2. B.$m=7, n=4$
  3. C.$m=14, n=9$
  4. D.$m=14, n=18$

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