GATE Physics: Questions 167 - 169 of 290

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Question number: 167

» Solid State Physics » Bonding in Solids

Appeared in Year: 2012

MCQ▾

Question

The ground state of sodium atom 11Na is a 2S12 state. The difference in energy levels arising in the presence of a weak external magnetic field B , given in terms of Bohr magneton, μB , is –

Choices

Choice (4) Response

a.

6μBB

b.

2μBB

c.

μBB

d.

4μBB

Question number: 168

» Atomic and Molecular Physics » Electric Dipole Transition and Selection Rules

Appeared in Year: 2016

MCQ▾

Question

Which of the following statements is NOT correct?

Choices

Choice (4) Response

a.

A deuteron can be disintegrated by irradiating it with gamma rays of energy 4MeV .

b.

A deuteron has no excited states.

c.

A deuteron has no electric quadrupole moment.

d.

The 1S0 state of deuteron cannot be formed.

Question number: 169

» Quantum Mechanics » Transmission Through One Dimensional Potential Barriers

Appeared in Year: 2011

MCQ▾

Question

An electron with energy E is incident from left on a potential barrier, given by, V(x)={0,forx<0V0,forx>0 as shown in the figure.

Segment f Segment f: Segment [A, B] Segment g Segment g: Segment [E, F] Vector u Vector u: Vector [C, D] Vector u Vector u: Vector [C, D] Vector v Vector v: Vector [G, H] Vector v Vector v: Vector [G, H] V (x) text1 = “V (x) “V (x) text1 = “V (x) “V (x) text1 = “V (x) “V (x) text1 = “V (x) “x text1_1 = “x”V_0 text1_2 = “V_0”V_0 text1_2 = “V_0”E text1_3 = “E”0 text1_4 = “0”

Graph of Potential Barrier

In figure graph of potential barrier is shown.

For E<V0 , the space part of the wavefunction for x>0 is of the form –

( α is a real positive quantity)

Choices

Choice (4) Response

a.

eiαx

b.

eiαx

c.

eαx

d.

eαx

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