CSIR Physical Sciences: Questions 288 - 289 of 401

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Question number: 288

» Electronics and Experimental Methods » Filtering and Noise Reduction

Appeared in Year: 2012

MCQ▾

Question

Band – pass and band – reject filters can be implemented by combining a low pass and a high pass filter in series and in parallel, respectively. If the cut – off frequencies of the low pass and high pass filter are ω0LP and ω0HP , respectively, the condition required to implement the band pass and band reject filter are, respectively – (December)

Choices

Choice (4) Response

a.

ω0HP>ω0LPandω0HP<ω0LP

b.

ω0HP>ω0LPandω0HP>ω0LP

c.

ω0HP<ω0LPandω0HP<ω0LP

d.

ω0HP<ω0LPandω0HP>ω0LP

Question number: 289

» Thermodynamic and Statistical Physics » Ising Model

Appeared in Year: 2012

MCQ▾

Question

Consider a one – dimensional Ising model with N spins, at very low temperature when almost all the spins are aligned parallel to each other. There will be a few spin flips with each flip costing an energy 2J . In a configuration with r spin flips, the energy of the system is E=NJ+2rJ and the number of configuration is NCr ; r varies from 0 to N. The partition function is – (December)

Choices

Choice (4) Response

a.

eNJkBT

b.

(sinhJkBT)N

c.

(coshJekBT)N

d.

(JkBT)N

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