Atoms and Nucle...

When an electron in hydrogen atom is excited, from its 4th to 5th stationary orbit, the change in angular momentum of electron is (Planck\'s constant:h = 6.6 × 10^–34 J-s)

The concept of stationary orbits was proposed by

In a hydrogen atom, the distance between the electron and proton is 2.5 × 10^–11 m. The electrical force ofattraction between them will be

If λ_max is 6563 Å, then wavelength of second line for Balmer series will be

What will be the angular momentum of an electron, if energy of this electron in H–atom is –1.5 eV (in J-s)?

Who discovered spin quantum number?

In Bohr\'s model, if the atomic radius of the first orbit is r₀, then the radius of the fourth orbit is

In hydrogen atom, it the difference in the energy of the electron in n = 2 and n = 3 orbits is E, the ionization energy of hydrogen atom is

The first member of the Paschen series in hydrogen spectrum is of wavelength 18,800 Å. The shortwavelength limit of Paschen series is

The ratio of the longest to shortest wavelengths in Lyman series of hydrogen spectra is