Atomic and Molecular Physics [GATE (Graduate Aptitude Test in Engineering) Physics]: Questions 53 - 57 of 58

Access detailed explanations (illustrated with images and videos) to 659 questions. Access all new questions- tracking exam pattern and syllabus. View the complete topic-wise distribution of questions. Unlimited Access, Unlimited Time, on Unlimited Devices!

View Sample Explanation or View Features.

Rs. 450.00 -OR-

How to register? Already Subscribed?

Question 53

Appeared in Year: 2006

Question

MCQ▾

The principal series of spectral lines of lithium is obtained by transitions between,

Choices

Choice (4)Response

a.

b.

c.

d.

Question 54

Atomic and Molecular Physics

Appeared in Year: 2006

Question

MCQ▾

The spectrum of ethanol comprises of three bunches of spectral lines. The number of spectral lines in the bunch corresponding to group is –

Choices

Choice (4)Response

a.

1

b.

2

c.

3

d.

4

Question 55

Atomic and Molecular Physics

Appeared in Year: 2006

Question

MCQ▾

To explain the observed magnetic moment of deuteron , its ground state wavefunction is taken to be an admixture of and states. The expectation value of the component of the magnetic moment in pure and pure states are and respectively. The contribution of the state to the mixed ground state is approximately –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 56

Atomic and Molecular Physics

Appeared in Year: 2006

Question

MCQ▾

In hyperfine interaction, there is coupling between the electron angular momentum and nuclear angular momentum , forming resultant angular momentum . The selection rules for the corresponding quantum number in hyperfine transitions are –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 57

Atomic and Molecular Physics

Appeared in Year: 2017

Describe in Detail

Essay▾

Positronium is an atom made of an electron and a positron. Given the Bohr radius for the ground state of the Hydrogen atom to be , the Bohr radius for the ground state of positronium is . (up to two decimal places) .

Explanation

The ground state energy of atom is,

If all other parameters are same for Hydrogen and Positronium,

Where, is effective mass of atom.

For hydrogen,

And for positronium,

From equation (1) , relation between ground state energies of Hydrogen and Positron is,

As we know,

Also,

Therefore, for Positronium;

Developed by: