Bohr model Quiz 1

Question 1

After overcoming many theories and their drawbacks, a Danish physicist proposed one more model of an atom. Bohr’s model was based on;

Accepted Answer

Planck's quantum theory of radiation.

Answer

Dual nature of matter.

Answer

Heisenberg’s uncertainty principle.

Answer

Discharge tube experiment.

Question 2

Given below is the diagram of the generation of spectral series in the hydrogen spectrum. Identify each of the following notations in the diagram according to the different transitions of the electron in the shells of an atom. $$ \ $$ <img  src="https://cmds-vedantu.s3.ap-southeast-1.amazonaws.com/prod/question-sets/7580de7a-d3fe-4d60-b6ea-d2701b64cf3b5028463419093193683.png"/>

Accepted Answer

$$A$$ – Lyman series, $$B$$ – Balmer series, $$C$$ – Paschen series, $$D$$ – Brackett series.

Answer

$$A$$ – Pfund series, $$B$$ – Lyman series, $$C$$ – Paschen series, $$D$$ – Balmer series.

Answer

$$A$$ – Brackett series, $$B$$ – Lyman series, $$C$$ – Pfund series, $$D$$ – Balmer series.

Answer

$$A$$ – Lyman series, $$B$$ – Balmer series, $$C$$ – Paschen series, $$D$$ – Pfund series.

Question 3

According to the generalised formula stated by Bohr’s model, we know the energy of an electron in an $$H$$ atom in the ground state is $$13.6 eV$$. What will be its energy in the second excited state?

Accepted Answer

– 1.51 eV

Answer

– 5.6 eV

Answer

– 2.35 eV

Answer

– 3.4 eV

Question 4

Pritesh is well known for the equation of radius of an orbit in the H – atom by Bohr’s atomic model. Can you help him to find the ratio of the second orbit to that of the third orbit?

Accepted Answer

$$\dfrac{4}{9}$$

Answer

$$\dfrac{9}{4}$$

Answer

$$\dfrac{6}{2}$$

Answer

$$\dfrac{2}{6}$$

Question 5

Which of the following has Bohr’s model helped us to calculate with respect to H – atom? $$ \ $$ $$(I)$$ Energy of the electron in particular orbit. $$ \ $$ $$(II)$$ Radius of each circular orbit. $$ \ $$ $$(III)$$ Velocity of electrons in any orbit. $$ \ $$ $$(IV)$$ Number of revolutions made by an electron around the nucleus. $$ \ $$ $$(V)$$ Ionisation energies of H -atom and H like atoms. $$ \ $$ $$(VI)$$ Wavelength of spectral lines.

Accepted Answer

All except $$(VI)$$ are correct.

Answer

All are correct.

Answer

None of them are correct.

Answer

Only $$(VI)$$ is correct.