The half life of a certain radio isotope is 10 minutes. The number of radioactive nuclei at a given instant of time is 108. Then the number of radioactive nuclei left 5 minutes later would be
Therefore 5 minutes of half-life. It follows that the number of nuclei left after 5 minutes will be
In an atom there are p photons, n neutrons and e electrons. For atoms of small mass, the relation between p, n and e is
Cal to protons ever attract each other?
How much energy is released when one amu is wholly converted into energy?
In the equation
The correct symbol for X is
The kinetic energy of a 300 K thermal neutron is
The energy released by the fission of one uranium atom is 200 MeV. The number of fissions per second required to produce 3.2 W of power is
The binding energy of deuteron is 1.15 MeV per nucleon and an alpha particle has a binding energy of 7.1 MeV per nucleon. Then in the reaction
the energy Q released is
What is the rest mass energy of an electron?
After two hours of the initial amount of a certain radioactive isotope remains undecayed. The half life of the isotope is
The half life of Pa – 218 is 3 minutes. What mass of a 16 g sample of Pa – 218 will remain after 15 minutes?