Date: December 2016
What are crystal imperfections Mention any two significance of it .
Chapter: [1] Crystal Structure
Write schrodinger’s time dependentand time independent wave equations of matter waves in one dimensional and state physical significance of these Equations.
Chapter: [2] Quantum Mechanics
Draw the I-V characteristics of a photo -diode. What is meant by dark current?
Chapter: [3] Semiconductor Physics
Define super conductivity and critical temperature. Plot the variation of resistance versus temperature in case of superconducting state of the material.
Chapter: [3] Semiconductor Physics
What is reverberation time? Discuss sabine formula.
Chapter: [6] Acoustics
State ‘magnetostriction effect’. Mention any two application of ultrasonic waves
Chapter: [7] Ultrasonics
Calculate conductivity of a germanium sample if a donar impurity atoms are added to the extent to one part in 106 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
Chapter: [4] Superconductivity
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.
Chapter: [2] Quantum Mechanics
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 /m3 and mobilities of electrons and holes are 0.36 m2 /volts sec and 0.17 m2 /volts sec respectively.
Chapter: [3] Semiconductor Physics
Draw and explain the unit cell of sodium chloride (NaCl) crystal determine effective number of NaCl molecule per unit cell and co-ordination number.
Chapter: [1] Crystal Structure
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.
Chapter: [3] Semiconductor Physics
Discuss formation of copper pairs and energy gap in superconductor on the basis of BCS theory.
Chapter: [4] Superconductivity
State any five factors affecting the acoustics of the building and give the remedies for each.
Chapter: [6] Acoustics
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.
Chapter: [7] Ultrasonics
How does the position of fermi energy level changes with increasing doping concentration in p-type semi-conductor ? sketch diagram.
Chapter: [3] Semiconductor Physics
Explain analysis of crystal structure using Bragg’s X ray spectrometer
Chapter: [1] Crystal Structure
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
Chapter: [3] Semiconductor Physics
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°?
Chapter: [1] Crystal Structure
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.
Chapter: [2] Quantum Mechanics
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University of Mumbai previous year question papers Semester 1 (FE First Year) Applied Physics 1 with solutions 2016 - 2017
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