Question

原子反应堆的功率为10⁴ kW,1 h消耗的燃料为8.75 g.已知每个²³⁵U裂变时放出的核能为2×10⁸ eV，求核燃料中²³⁵U所占的百分比.

Answer 1

5%

解析:

本题考查核反应堆.

W=Pt=10⁷×3600 J=3.6×10¹⁰ J                                                                         (2分)

W₁=2×10⁸ eV=3.2×10^-11 J                                                                               (2分)

n==1.125×10²¹                                                                   (2分)

m=235n u=235×1.125×10²¹×1.66×10^-27 kg=4.39×10^-4 kg=0.439 g                  (2分)

=5%.                                                                                                  (2分)