Engineering FE Engineering Common Sem 1 Applied Physics Dec 2022 R16 Question Paper - Mumbai University | munotes

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Questions asked in this paper

(4) Figures to the right indicate marks

Q1 Attempt any five questions from the following- 15 marks
- (a) Calculate atomic packing fraction of FCC Lattice
- (b) Derive the De-Broglie wavelength
- (c) Draw the energy band diagram for p-n junction diode in equilibrium condition
- (d) Define: Persistent current, critical temperature, critical magnetic field What is reverberation time? Explain its formula
- (f) With the help of diagram state direct and inverse piezoelectric effect
- (g) The resistivity of intrinsic material at room temperature is 2 x Ohm-cm. If the mobility of electron is 6 m*/V-sec and mobility of hole is 0.2 m*/V-sec Calculate its intrinsic carrier density
Q2 (a) Prove that electron cannot survive within the nucleus. An electron has a speed of 400m/s with uncertainty of 0.01% . Find the accuracy in its 8 marks
- (b) What is the Hall effect? obtain the expression for (a) Hall voltage and (b) Hall
Q3 (a) With neat diagram of unit cell explain the structure of diamond crystal. 8 marks
- (b) Explain variation of Fermi level with temperature in n-type semiconductor. 7 What is the probability of an electron being thermally excited to the conduction band? If the Si is at The band gap energy is 1.12eV (k=1.38X J/K)
Q4 (a) Distinguish between Type I and Type II superconductors. 5 marks
- (b) A class room has dimension of (20x15x10) the reverberation time sec. 5 Calculate the total absorption of its surfaces and average coefficient of absorption
- (c) How ultrasonic waves are produced using quartz crystal in an oscillator? 5
Q5 (a) Show that for an intrinsic semiconductor, the Fermi level lies half way between Conduction and valence band 5 marks
- (b) Find the depth of sea water from a ship on the sea surface if the time interval of 2 seconds is required to receive the signal back Given that temperature of sea water , Salinity of sea water =10gm/lit 5
- (c) The lowest energy of an electron trapped in a one dimensional box is 5
- J. Calculate the width of the box. Also calculate the next two energies in eV the particle can have?
Q6 (a) Define ligancy and critical radius ratio. Calculate critical radius ratio for ligancy 6. 5 marks
- (c) Explain photovoltaic effect and write a note on solar cell. 5

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