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 10^{6 } germanium atoms at room temperature.

Assume that only one electron of each atom takes part in conduction process.

Given:- Avogadro’s number = 6.023 × 10^{23 }atom/gm-mol .

Atomic weight of Ge = 72.6

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

Density of Ge = 5.32 gm/ cm^{3}

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^{-27}kg.

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 cm^{2 }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 2×10^{19 }/m^{3 } and mobilities of electrons and holes are 0.36 m^{2 }/volts sec and 0.17 m^{2 }/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^{-14}m. Given mass of neutron = 1.675×10^{-27}kg

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

#### Submit Question Paper

Help us maintain new question papers on Shaalaa.com, so we can continue to help studentsonly jpg, png and pdf files

## University of Mumbai previous year question papers Semester 1 (FE First Year) Applied Physics 1 with solutions 2016 - 2017

Previous year Question paper for University of Mumbai Semester 1 (FE First Year) Applied Physics 1-2017 is solved by experts. Solved question papers gives you the chance to check yourself after your mock test.

By referring the question paper Solutions for Applied Physics 1, you can scale your preparation level and work on your weak areas. It will also help the candidates in developing the time-management skills. Practice makes perfect, and there is no better way to practice than to attempt previous year question paper solutions of University of Mumbai Semester 1 (FE First Year).

How University of Mumbai Semester 1 (FE First Year) Question Paper solutions Help Students ?

• Question paper solutions for Applied Physics 1 will helps students to prepare for exam.

• Question paper with answer will boost students confidence in exam time and also give you an idea About the important questions and topics to be prepared for the board exam.

• For finding solution of question papers no need to refer so multiple sources like textbook or guides.