CSIR Physical Sciences: Questions 264 - 266 of 389

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Question number: 264

» Electromagnetic Theory » Radiation- From Moving Charges

Appeared in Year: 2014

MCQ▾

Question

An electromagnetically – shielded room is designed so that at a frequency ω=107rads the intensity of the external radiation that penetrates the room is 1 % of the incident radiation. If σ=12π×106(Ωm)1 is the conductivity of the shielding material, its minimum thickness should be –

(Given that ln10=2.3 ) (June – 2014)

Choices

Choice (4) Response

a.

0.46mm

b.

0.23mm

c.

4.60mm

d.

2.30mm

Question number: 265

» Thermodynamic and Statistical Physics » Bose-Einstein Condensation

Appeared in Year: 2014

MCQ▾

Question

The recently discovered Higgs boson at the LHC experiment has a decay mode into a photon and a Z boson. If the rest masses of the Higgs and Z boson are 125GeVc2 and 90GeVc2 respectively, and the decaying Higgs particle is at rest, the energy of photon will approximately be – (June – 2014)

Choices

Choice (4) Response

a.

15GeV

b.

30GeV

c.

353GeV

d.

35GeV

Question number: 266

» Quantum Mechanics » Variational Method

Appeared in Year: 2013

MCQ▾

Question

The bound on the ground state energy of the Hamiltonian with an attractive delta – function potential, namely H=22md2dx2αδ(x)

Using the variational principle with the trial wavefunction ψ(x)=Aexp(bx2) is – [Given:0ettadt=Γ(a+1)] (June)

Choices

Choice (4) Response

a.

mα24π2

b.

mα25π2

c.

mα22π2

d.

mα2π2

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