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Gaokao Physics Practice Question

4. 一点光源以 $113 \mathrm{~W}$ 的功率向周围所有方向均匀地辐射波长约为 $6 \times 10^{-7} \mathrm{~m}$ 的光, 在离点光源距离为 $R$ 处 每秒垂直通过每平方米的光子数为 $3 \times 10^{14}$ 个。普朗克常量为 $h=6.63 \times 10^{-34} \mathrm{~J} \mathrm{~s} 。 R$ 。约为 ()

  1. A.$1 \times 10^{2} \mathrm{~m}$
  2. B.$3 \times 10^{2} \mathrm{~m}$
  3. C.$6 \times 10^{2} \mathrm{~m}$
  4. D.$9 \times 10^{2} \mathrm{~m}$

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