Engineering FE Engineering Common Sem 1 2022 December 2022 R 16 Applied Physics I Question Paper - Mumbai University | munotes
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Questions asked in this paper
- (4) Figures to the right indicate marks
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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
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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
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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)
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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
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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?
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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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