PhysicsAdvancedHigh School (11–12)Modern Physics › Nuclei and RadioactivityJEE MainNEETAEEE (Amrita)AMUEEEAP EAPCETBCECE
Created by StemPy LabTwo radioactive samples, X and Y, decay independently into stable nuclei. At time zero the activity of X is times that of Y. The half-life of X is and that of Y is . After some time the two activities become equal. What is the ratio of the number of undecayed nuclei of X to that of Y at that time ?
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← Four statements about nuclei follow. (i) The density of nuclear matter is nearly the same for all nuclei. (ii) A nucleus of mass number 64 has twice the radius of one of mass number 16. (iii) A proton-proton nuclear force is much stronger than a proton-neutron one. (iv) The force between nucleons is repulsive below about 0.8 fm and attractive beyond. How many of the statements above are correct?Two statements about beta decay are given below.
Statement I: In the beta minus decay of a nuclide, every electron is emitted with the same kinetic energy, because the daughter nucleus takes up the rest of the energy released.
Statement II: The antineutrino emitted in beta minus decay carries away electric charge, so the daughter nucleus has one unit more charge than the parent. →
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