A positronium consists of an electron and a positron revolving about their common centre of mass. Calculate the separation between the electron and positron in their first excited state:

A positronium atom consist of an electron and a positron revolving about their common centre of mass . Calculate Separation between the electron and positron in their first excited state.

A positronium atom consist of an electron and a positron revolving about their common centre of mass . Calculate Kinetic energy of the electron in ground state

Calculate the orbital period of the electron in the first excited state of hydrogen atom.

Calculate the orbital period of the electron in the first excited state of hydrogen atom.

Positronium consists of an electron and a positron (same mass opposite charge) orbiting around their common center of mass .The spectrum is, therefore expected to be hydrogen like , the difference arising from the mass difference .Calculate the wavelength of the first three line of the balmer series of positronium.

Calculate the energy released when an electron annihilates a positron.

the energy required to excite an electron in hydrogen atom to its first excited state is

the energy required to excite an electron in hydrogen atom to its first excited state is