What is the rest mass energy of an electron?
The ratio of the wavelengths of the longest wavelength lines in the Lyman and Balmer series of hydrogen spectrum is
If a hydrogen atom at rest, emits a photon of wavelength , the recoil of the atom of mass m is given by
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
After two hours of the initial amount of a certain radioactive isotope remains undecayed. The half life of the isotope is