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Applied Physics 1 CBCGS 2016-2017 BE Civil Engineering Semester 1 (FE First Year) Question Paper Solution

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Applied Physics 1 [CBCGS]
Marks: 60 University of Mumbai
BE Civil Engineering
BE Computer Engineering
BE Mechanical Engineering
BE Biotechnology
BE Marine Engineering
BE Printing and Packaging Technology
BE Production Engineering
BE IT (Information Technology)
BE Electrical Engineering
BE Electronics and Telecommunication Engineering
BE Instrumentation Engineering
BE Electronics Engineering
BE Chemical Engineering
BE Construction Engineering
BE Biomedical Engineering
BE Automobile Engineering

Academic Year: 2016-2017
Date: दिसंबर 2016
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[21]1
[3]1.a

What are crystal imperfections Mention any two significance of it .

Concept: undefined - undefined
Chapter: [1] Crystal Structure
[3]1.b

Write schrodinger’s time dependentand time independent wave equations of matter waves in one dimensional and state physical significance of these Equations. 

Concept: undefined - undefined
Chapter: [2] Quantum Mechanics
[3]1.c

Draw the I-V characteristics of a photo -diode. What is meant by dark current?

Concept: undefined - undefined
Chapter: [3] Semiconductor Physics
[3]1.d

Define super conductivity and critical temperature. Plot the variation of resistance versus temperature in case of superconducting state of the material. 

Concept: undefined - undefined
Chapter: [3] Semiconductor Physics
[3]1.e

What is reverberation time? Discuss sabine formula. 

Concept: undefined - undefined
Chapter: [6] Acoustics
[3]1.f

State ‘magnetostriction effect’. Mention any two application of ultrasonic waves

Concept: undefined - undefined
Chapter: [7] Ultrasonics
[3]1.g

Calculate conductivity of a germanium sample if a donar impurity atoms are added to the extent to one part in 10 germanium atoms at room temperature.
Assume that only one electron of each atom takes part in conduction process.

Given:- Avogadro’s number = 6.023 × 1023 atom/gm-mol . 
Atomic weight of Ge = 72.6

Mobility of electrons = 3800` (cm^2) / ( "volts") ` sec

Density of Ge = 5.32 gm/ cm3

 

Concept: undefined - undefined
Chapter: [4] Superconductivity
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[15]2
[8]2.a

Describe with the necessary theory the davisson and german establishing wave nature of electrons. Calculate the de-broglie wavelength of an alpha particle accelerating through a potential difference of 200 volts given :- mass of alpha
particle = 6.68×10-27kg. 

Concept: undefined - undefined
Chapter: [2] Quantum Mechanics
[7]2.b

Define the term drift current and mobility of a charge carriers. Calculate the current product in a germanium sample of area of cross section 1 cm2 and thickness of 0.01 m, when a potential difference of 2V is applied cross it. Given :- the concentration of free electron in germanium is 2×1019 /m and mobilities of electrons and holes are 0.36 m2 /volts sec and 0.17 m2 /volts sec respectively.

Concept: undefined - undefined
Chapter: [3] Semiconductor Physics
[15]3
[8]3.a

Draw and explain the unit cell of sodium chloride (NaCl) crystal determine effective number of NaCl molecule per unit cell and co-ordination number.

Concept: undefined - undefined
Chapter: [1] Crystal Structure
[7]3.b

State application of Hall effect. In a Hall effect experiment a potential difference of 4.5 μV is developed across a foil of zinc of thickness 0.02mm when a current of 1.5 A is carrying in a direction perpendicular to applied magnetic field of 2 tesla. Calculate :-

• Hall coefficient for zinc.

•  Concentration of electron.

Concept: undefined - undefined
Chapter: [3] Semiconductor Physics
[15]4
[5]4.a

Discuss formation of copper pairs and energy gap in superconductor on the basis of BCS theory.

Concept: undefined - undefined
Chapter: [4] Superconductivity
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[5]4.b

State any five factors affecting the acoustics of the building and give the remedies for each. 

Concept: undefined - undefined
Chapter: [6] Acoustics
[5]4.c

An ultrasonic pulse of 0.09M Hz sends down towards the sea-bed which returns after 0.55 seconds. The velocity of ultrasonic waves in sea water is 1800 m/sec . calculate the depth of sea and wavelength of ultrasonic pulse.

Concept: undefined - undefined
Chapter: [7] Ultrasonics
[15]5
[5]5.a

How does the position of fermi energy level changes with increasing doping concentration in p-type semi-conductor ? sketch diagram.

Concept: undefined - undefined
Chapter: [3] Semiconductor Physics
[5]5.b

 Explain analysis of crystal structure using Bragg’s X ray spectrometer

Concept: undefined - undefined
Chapter: [1] Crystal Structure
[5]5.c

Find the minimum energy of neutron confined to a nucleus of size of the order of 10-14m. Given mass of neutron = 1.675×10-27kg 

Concept: undefined - undefined
Chapter: [3] Semiconductor Physics
[15]6
[5]6.a

Calculate the critical radius ratio of an ionic crystal in ligancy-6 . what is the maximum size of cation in ligancy 6 configuration when size of anion is 2.02A°?

Concept: undefined - undefined
Chapter: [1] Crystal Structure
[5]6.b

What do you mean by group and phase velocity? Show that the de-Broglie group velocity associated with the wave packet is equal to the velocity of the particle.

Concept: undefined - undefined
Chapter: [2] Quantum Mechanics
[5]6.c

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