GATE (Graduate Aptitude Test in Engineering) Physics: Questions 127 - 129 of 659

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Question number: 127

» Thermodynamics and Statistical Physics » Degenerate Fermi Gas

Appeared in Year: 2012

MCQ▾

Question

For an ideal Fermi gas in three dimensions, the electron velocity at the Fermi surface is related to electron concentration as,

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Question number: 128

» Thermodynamics and Statistical Physics » Partition Function

Appeared in Year: 2012

MCQ▾

Question

A paramagnetic system consisting of N spin – half particles, is placed in an external magnetic field. It is found that spins are aligned parallel and the remaining spins aligned antiparallel to the magnetic field. The statistic entropy of the system is –

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Question number: 129

» Thermodynamics and Statistical Physics » Calculation of Thermodynemic Quantities

Appeared in Year: 2012

MCQ▾

Question

Inverse susceptibility as a function of temperature, for a material undergoing paramagnetic to ferromagnetic transition is given in the figure, where is the origin. The values of the Curie constant, , and the Weiss molecular field constant, , in CGS units, are –

Segment f Segment f: Segment [C, D] Segment g Segment g: Segment [E, F] Segment h Segment h: Segment [F, G] Vector u Vector u: Vector [A, B] Vector u Vector u: Vector [A, B] Vector v Vector v: Vector [H, I] Vector v Vector v: Vector [H, I] Vector w Vector w: Vector [J, K] Vector w Vector w: Vector [J, K] Point F Point F: Point on fPoint F Point F: Point on ffrac1? text1 = “frac1? “frac1? text1 = “frac1? “frac1? text1 = “frac1? “O text1_1 = “O”T text1_2 = “T”-2×10^4 text1_3 = “-2×10^4”-2×10^4 text1_3 = “-2×10^4”-2×10^4 text1_3 = “-2×10^4”-2×10^4 text1_3 = “-2×10^4”-2×10^4 text1_3 = “-2×10^4”-2×10^4 text1_3 = “-2×10^4” (CGS unit) text1_4 = ” (CGS unit) “600 K text1_5 = “600 K”600 K text1_5 = “600 K”600 K text1_5 = “600 K”600 K text1_5 = “600 K”

Inverse Susceptibility vs Temperature

In figure inverse susceptibility as a function of temperature for a material undergoing paramagnetic to ferromagnetic transition is given.

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Choice (4) Response

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c.

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