(i) Calculate the first three energy levels for positronium.
(ii) Fine the wavelength of the `H_(a)` line `(3 rarr2"transition")` of positronium.

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 difference in energies of two levels between which a transition of wavelength 4000^o A takes place.

The wavelength for n=3 to n=2 transition of the hydrogen atom is 656.3 nm. What are the wavelength for this same transition in (a) positronium, which consists of an electron and a positron (b) singly ionized helium

The wavelength for n=3 to n=2 transition of the hydrogen atom is 656.3 nm. What are the wavelength for this same transition in (a) positronium, which consists of an electron and a positron (b) singly ionized helium

The wavelength of the first balmer line caused by a transition from the n = 3 level to the n = 2 level in hydrogen is lamda_(1) . The wavelength of the line caused by an electronic transition from n =5 to n =3 is

The wavelength of the first balmer line caused by a transition from the n = 3 level to the n = 2 level in hydrogen is lamda_(1) . The wavelength of the line caused by an electronic transition from n =5 to n =3 is

Wavelength of the Balmer H, line (first line) is 6565 Å . Calculate the wavelength of H_(beta) (second line).

Wavelength of the Balmer H, line (first line) is 6565 Å . Calculate the wavelength of H_(beta) (second line).