ATOMS Set 1

In Bohr's model of hydrogen atom, which of the following pairs of quantities are quantized?

Energy required for the electron excitation in from the first to the third Bohr orbit is

First Bohr radius of an atom with is . Radius of its third orbit is

In the Bohr model of a hydrogen atom, the centripetal force is furnished by the coulomb attraction between the proton and the electron. If is the radius of the ground state orbit, is the mass and is charge on the electron and is the vacuum permittivity, the speed of the electron is

The ratio of minimum wavelength of Lyman and Balmer series will be

The ionisation potential of hydrogen atom is . An electron in the ground state of a hydrogen atoms absorbs a photon of energy How many different spectral line can one expect when the electron make a downward transition?

A charged particle q is shot towards another charged particle Q which is fixed, with a speed v. It approaches Q upto a closest distance and then returns. If was given a speed , the closest distance of approach would be

Ionization potential of hydrogen atom is13.6 . Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 . According to Bohr's theory, the spectral lines emitted by hydrogen will be

The first member of the Balmer's series of the hydrogen has a wavelength , the wavelength of the second member of its series is

The ratio of areas of the electron orbits for the first excited state and the ground state for the hydrogen atom is