(Alpha decay of uranium-238) The mass excess values of the following nuclides are: •…

PHYSICS · Multi-part · CBSE · Physics · Nuclei · Nuclei

Problem

(Alpha decay of uranium-238) The mass excess values of the following nuclides are: • 238^{238}U : 47.3 MeV  • 234^{234}Th : 40.6 MeV  • 4^{4}He : 2.42 MeV (1 u corresponds to 931.5 MeV.) Consider the decay 92238^{238}_{92}U → 90234^{234}_{90}Th + 24^{4}_{2}He Answer the following: (i) Calculate the QQ-value of the decay in MeV. (ii) State whether the decay releases energy or absorbs energy and justify your answer using the value obtained in part (i).

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