Atomic & Molecular Physics (CSIR Physical Sciences): Questions 4 - 6 of 18

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Question number: 4

» Atomic & Molecular Physics » Zeeman, Paschen-Bach & Stark Effects

Appeared in Year: 2014

MCQ▾

Question

An atomic transition 1P 1S in a magnetic field 1 Tesla shows Zeeman splitting. Given that the Bohr magneton μB=9.27×1024JT , and the wavelength corresponding to the transition is 250 nm, the separation in the Zeeman spectral lines is approximately, (December)

Choices

Choice (4) Response

a.

0.001 nm

b.

10 nm

c.

1.0 nm

d.

0.1 nm

Question number: 5

» Atomic & Molecular Physics » Relativistic Corrections for Energy Levels of Hydrogen Atom

Appeared in Year: 2013

MCQ▾

Question

The energy of an electron in a band as a function of its wave vector k is given by E(k)=E0B(coskxa+coskya+coskza) , where E0,B and a are constants. The effective mass of the electron near the bottom of the band is – (Dec -2013)

Choices

Choice (4) Response

a.

23Ba2

b.

223Ba2

c.

22Ba2

d.

2Ba2

Question number: 6

» Atomic & Molecular Physics » Diatomic Molecules » Vibrational

Appeared in Year: 2013

MCQ▾

Question

The phonon dispersion for the following one – dimensional diatomic lattice with masses M1 and M2 (as shown in figure)

Diagram of phonon dispersion

Diagram of Phonon Dispersion

In figure the phonon dispersion for the following one – dimensional diatomic lattice with masses M1 and M2.

is given by, ω2(q)=K(1M1+1M2)[1±14M1M2M1+M2sin2(qa2)]

where a is the lattice parameter and K is the spring constant. The velocity of sound is – (June)

Choices

Choice (4) Response

a.

K(M1+M2)2M1M2a

b.

K(M1+M2)M1M2a

c.

K2(M1+M2)a

d.

KM1M22(M1+M2)3a

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