A-LevelPhysicsNuclear physicsFeb/Mar 2020Paper 4 Q127 Marks
12 (a) Explain what is meant by the binding energy of a nucleus. (b) The following nuclear reaction takes place: ²³⁵U + ⁰n → ¹⁴⁴Cs + ^xRb + y⁰n (c) Yttrium-90 decays into zirconium-90, a stable isotope. A sample initially consists of pure yttrium-90. Calculate the time, in days, when the ratio of the number of yttrium-90 nuclei to the number of zirconium-90 nuclei would be 2.0. The half-life of yttrium-90 is 2.7 days.
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