Elementary Particles (id: a5f629bac)

本题目来源于试卷: Elementary Particles，类别为 IB物理学

[填空题]
What strength of mag r pmnfxr/ 7;c)1qimvcd4 *+bdnet)6ujwh7 m dap2jw6lleq+ 7py*ic field is used in a cyclotron in which protons make $2.8 \times 10^7$ revolutions per second? $f$ =    T

参考答案: 1.8±2%


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