Condensed Matter Physics (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 7 - 10 of 19

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Question number: 7

» Condensed Matter Physics » Hall Effect and Thermoelectric Power

Appeared in Year: 2012

MCQ▾

Question

A magnetic field sensor based on the Hall effect is to be fabricated by implanting As into a Si film of thickness . The specifications require a magnetic field sensitivity of at an excitation current of . The implantation dose is to be adjusted such that the average carrier density, after activation, is – (December)

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Question number: 8

» Condensed Matter Physics » Bonding of Solids

Appeared in Year: 2012

MCQ▾

Question

The radius of the Fermi sphere of free electrons in a monovalent metal with an structure, in which the volume of the unit cell is is –

(December)

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Question number: 9

» Condensed Matter Physics » Band Theory of Solids » Semiconductors

Appeared in Year: 2012

MCQ▾

Question

In a band structure calculation, the dispersion for electrons is found to be, Where is a constant and is the lattice constant. The effective mass at the boundary of the first Brillouin zone is – (December)

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Question number: 10

» Condensed Matter Physics » Elastic Properties

Appeared in Year: 2012

MCQ▾

Question

A resistance strain gauge is fastened to a steel fixture and subjected to a stress of . If the gauge factor is 3 and the modulus of elasticity of steel is , then the fractional change in resistance of the strain gauge due to the applied stress is –

(Note: The gauge factor is defined as the ratio of the fractional change in resistance to the fractional change in length. ) (June)

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