Who observed that when the nucleus of a uranium atom was bombarded with fast-moving neutrons,it became so unstable that it immediately broke into two nuclei of nearly equal mass,besides other fragments?
- A$J.J.$ Thomson
- BChadwick
- CEinstein
- DHahn and Strassmann
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If the mass defect of ${ }_{5}B^{11}$ is $0.081 \ u$,its average binding energy (in $MeV$) is
The energy required to separate a neutron and a proton from the nucleus is called:
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