PhysicsAdvancedHigh School (11–12)Modern Physics › Nuclei and RadioactivityNEETAEEE (Amrita)AMUEEEAP EAPCETBCECECMI Entrance
Created by StemPy LabFour statements about nuclei follow. (i) The density of nuclear matter is nearly the same for all nuclei. (ii) A nucleus of mass number has twice the radius of one of mass number . (iii) A proton-proton nuclear force is much stronger than a proton-neutron one. (iv) The force between nucleons is repulsive below about and attractive beyond. How many of the statements above are correct?
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← The figure shows the binding energy per nucleon of six nuclei against their mass numbers. The values are read straight from the figure. The total binding energy of a nucleus is its binding energy per nucleon times its mass number. Which of the following nuclear changes is described correctly, using only these values and no others?Two radioactive samples, X and Y, decay independently into stable nuclei. At time zero the activity of X is 4 times that of Y. The half-life of X is 2.0 h and that of Y is 6.0 h. After some time t the two activities become equal. What is the ratio of the number of undecayed nuclei of X to that of Y at that time t? →
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