Atoms

Assuming the validity of Bohr's atomic model for hydrogen-like ions the radius of Li++ ion in its ground state is given by 1Xa0, where X = (Where a0 is the first Bohr's radius.)

1. 2
2. 9
3. 1
4. 3

The number of spectral lines emitted by atomic hydrogen that is in the 4th energy level, is

1. 3
2. 6
3. 1
4. 0

The frequency of revolution of the electron in Bohr's orbit varies with n, the principal quantum number as:

1. 1n4
2. 1n2
3. 1n3
4. 1n

During the transition of electron from state A to state C of a Bohr atom, the wavelength of emitted radiation is 2000 and it becomes 6000 when the electron jumps from state B to state C. Then the wavelength of the radiation emitted during the transition of electrons from state A to state B is

1. 4000
2. 6000
3. 2000
4. 3000

An electron in the ground state of the hydrogen atom has the orbital radius of 5.3 10-11 m while that for the electron in third excited state is 8.48 10-10 m. The ratio of the de Broglie wavelengths of electron in the ground state to that in the excited state is

1. 4
2. 3
3. 9
4. 16