Question

1. Name two isotopes of uranium which are fissionable.
2. Which of the isotope mentioned in part (a) above is easily fissionable? Give reason.
3. State whether the neutron needed for fission reaction of the isotope mentioned in part (b) above, is slow or fast?

Answer 1

1. \[\ce {^235_92 U and ^235_92 U}\]
2. Experimentally it is found that isotope of  \[\ce {^235_92 U}\] is more easily fissionable because the fission of \[\ce {^235_92 U}\] is possible by slow neutron unlike \[\ce {^235_92 U}\] where fission is possible only by the fast neutrons.
3. Slow neutron is needed.