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# Applied Physics 1 CBCGS 2017-2018 BE Electronics Engineering Semester 1 (FE First Year) Question Paper Solution

SubjectApplied Physics 1
Year2017 - 2018 (December)
Applied Physics 1
CBCGS
2017-2018 December
Marks: 60

1) Question no 1 is compulsory

2) Attempt ant three questions from Q.2 to Q.6 .

1 | Attempt ant five
1.a

‘Crystal acts as three dimensional grating for X-rays’, explain.

Chapter:  Crystal Structure
Concept: X-ray Diffraction
1.b

Calculate the frequency and wavelength of photon whose energy is 75eV.

Chapter:  Quantum Mechanics
Concept: De Broglie Wavelength
1.c

Draw the energy band diagram  of p-n junction diode in forward and reverse bias condition .

Chapter:  Semiconductor Physics
Concept: Fermi Level Diagram for P-N Junction
1.d

“Superconductor is a perfect diamagnetic”, Explain.

Chapter:  Superconductivity
Concept: Meissner Effect
1.e

What is reverberation time? How it is important ? write the factors affecting reverberation time.

Chapter:  Acoustics
Concept: Reflection of Sound(Reverberation and Echo)
1.f

A quartz crystal of thickness 1.5 mm vibrating with resonance. Calculate it’s fundamental frequency if the Young’s modulus of quartz crystal is 7.9×1010N/m2 and density is 2650 kg/m3

Chapter:  Crystal Structure
Concept: Study of characteristics of unit cell of Diamond, ZnS, NaCl and HCP;
1.g

Mobility of electron and hole in a sample of Ge at room temperature are 0.36 m2 /V-sec and 0.17m2 /V-sec respectively. If electron and holes densities are equal and it is 2.5 ×1013 /cm3 , calculate its conductivity.

Chapter:  Semiconductor Physics
Concept: Conductivity, mobility, current density (drift & diffusion) in semiconductors(n type and p type)
2
2.a

With Heisenberg’s uncertainty principle prove that electron cannot survive in nucleus. An electron has a speed of 300m/sec. with uncertainty of 0.01% . find the accuracy in its position.

Chapter:  Quantum Mechanics
Concept: Heisenberg’S Uncertainty Principle
2.b

Show that fermi energy level in intrinsic semiconductor is at the Centre of forbidden energy gap. What is the probability of an electron being thermally excited to the conduction band in Si at 30℃. The band gap energy is 1.12 eV.

Chapter:  Semiconductor Physics
Concept: Fermi Energy Level in Intrinsic Semiconductors
3
3.a

With neat diagram of unit cell , explain the structure of HCP crystal and calculate the no. of ions per unit cell, co ordination no., lattice constant and packing factor of the structure.

Chapter:  Crystal Structure
Concept: Study of characteristics of unit cell of Diamond, ZnS, NaCl and HCP;
3.b

State the Hall effect. Derive the expression for Hall voltage and Hall coefficient with neat diagram.

Chapter:  Semiconductor Physics
Concept: Hall Effect
4
4.a

What is the working principle of maglev? Explain how it can acquire high speed?

Chapter:  Superconductivity
Concept: Applications of superconductors- SQUID, MAGLEV
4.b

A hall of dimension 25×18×12m3 has an average absorption coefficient 0.2. find the reverberation time. If a curtain cloth of area 150m2 is suspended at the  centre of Hall with coefficient of absorption 0.75, What will be the reverberation
time?

Chapter:  Acoustics
Concept: Reflection of Sound(Reverberation and Echo)
4.c

State the piezoelectric effect. With neat circuit diagram explain the principle and working of piezoelectric oscillator .

Chapter:  Ultrasonics
Concept: Piezoelectric Oscillator
5
5.a

With energy band diagram ,explain the variation of fermi energy level with temperature in extrinsic semiconductor .

Chapter:  Semiconductor Physics
Concept: Fermi energy level in extrinsic semiconductors
5.b

Explain with example how to determine crystal structure by Bragg’s X-ray spectrometer.

Chapter:  Crystal Structure
Concept: Bragg’S Law
5.c

Obtain one dimensional time dependent time independent Schrodinger equation.

Chapter:  Quantum Mechanics
Concept: Schrodinger’S Time Dependent Wave Equation
6
6.a

Chapter:  Crystal Structure
Concept: Study of characteristics of unit cell of Diamond, ZnS, NaCl and HCP;
6.b

What is the significance of wave function ? derive the expression for energy eigen values for the free particle in one dimensional potential well.

Chapter:  Quantum Mechanics
Concept: Wave Function
6.c

What is photovoltaic effect? Explain the principle and working of solar cell.

Chapter:  Semiconductor Physics
Concept: Applications of semiconductors : Rectifier diode, LED, Zener diode, Photo diode, Photovoltaic cell, BJT, FET, SCR., MOSFET

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