Bohrs Model Of Atom

The ionization potential of the hydrogen atom is 13.6 V. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr’s theory, the spectral lines emitted by hydrogen will be:

1. two

2. three

3. four

4. one

The total energy of an electron in the ground state of a hydrogen atom is -13.6 eV. The kinetic energy of an electron in the first excited state is:
1. 3.4 eV

2. 6.8 eV

3. 13.6 eV

4. 1.7 eV

The ionization energy of the electron in the hydrogen atom in its ground state is . The atoms are excited to higher energy levels to emit radiations of wavelengths. The maximum wavelength of emitted radiation corresponds to the transition between:

1.
2.
3.
4.

The energy of a hydrogen atom in the ground state is eV. The energy of a ion in the first excited state will be:
1. eV
2. eV
3. eV
4. eV

An electron of a stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquired as a result of photon emission will be:
( is the mass of hydrogen atom, is Rydberg constant and is Plank’s constant)

1.		2.
3.		4.

Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be . The threshold frequency of the material is:
1.
2.
3.
4.

If an electron in a hydrogen atom jumps from the orbit to the orbit, it emits a photon of wavelength $$. When it jumps from the orbit to the orbit, the corresponding wavelength of the photon will be:

1.		2.
3.		4.

The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom is:
1.
2.
3.
4.

The total energy of an electron in the orbit of an atom is Its kinetic and potential energies are, respectively:

1.
2.
3.
4.

The total energy of an electron in the stationary orbit of the hydrogen atom can be obtained by:
1.
2.
3.
4.

Let and be the energy of an electron in the first and second excited states of the hydrogen atom, respectively. According to Bohr's model of an atom, the ratio is:

1.		2.
3.		4.

The radius of innermost orbit of a hydrogen atom is What is the radius of the third allowed orbit of a hydrogen atom?

1.		2.
3.		4.