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Standard XII
Physics
Nuclear fusion – Energy Generation in Stars
Question

The cesium isotope $$137^{Cs}$$ is present in the fallout from aboveground detonations of nuclear bombs. Because it decays with a slow (30.2 y) half-life into $$ 137^{Ba} . releasing considerable energy in the process, it is of environmental concern. The atomic masses of the Cs and Ba are 136.9071 and 136.9058 u, respectively; calculate the total energy released in such a decay.

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Q1
The cesium isotope $$137^{Cs}$$ is present in the fallout from aboveground detonations of nuclear bombs. Because it decays with a slow (30.2 y) half-life into $$ 137^{Ba} . releasing considerable energy in the process, it is of environmental concern. The atomic masses of the Cs and Ba are 136.9071 and 136.9058 u, respectively; calculate the total energy released in such a decay.
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Calculate the energy released if $$U^{238}$$-nucleus emits an $$\alpha-$$particle.
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Calculate the energy released in MeV in the following nuclear reaction
$$^{238}_{92}U \rightarrow ^{234}_{90}Th + ^{4}_{2}He + Q$$
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Is the decay spontaneous ? Give reasons.
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A stationary U238 nucleus undergoes α- decay. If the kinetic energy of product nucleus is E, the total energy released in the process is-
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