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Applied Physics 1 Question Paper - Dec 18 - First Year Engineering (Semester 1) - Mumbai University (MU)
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written 4.9 years ago by
rutujakhilari12345
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Applied Physics 1 - Dec 18
First Year Engineering (Semester 1)
Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.
1.a.
Draw (123),(321),(102)
(3 marks)
00
1.b.
Explain with diagram HCP until cell based on lattice parameter.
(3 marks)
00
1.c.
State properties of matter waves.
(3 marks)
00
1.d.
Calculate electron & hole concentration in intrinsic Si at room temperature if its electrical conductivity is 4x 10$^-4$ ohm/m.Given the mobility of electron = 0.14m$^2$/V- sec
(3 marks)
00
1.e.
Explain Meissner Effect with the help of diagram.
(3 marks)
00
1.f.
A conference room has total volume of 2000m$^3$ .The magnitude of total absorption within the conference room is 100 sabin.Calculate the reverberation time.
(3 marks)
00
1.g.
Discuss any three application of Ultrasonic waves.
(3 marks)
00
2.a.
State Heisenberg's Uncertainty Principle.Show that electron doesn't exist in the nucleus.Find the accuracy in the position of n electron moving with speed 350 m/sec with uncertainty pf 0.01%.
(8 marks)
00
2.b.
Show that for intrinsic semiconductors for Fermi level lies midway between the conduction band and the valence band.With the help of diagram explain effect of impurity concentration on Fermi level of N type semiconductor.
(7 marks)
00
3.a.
Derive Bragg's condition for X-ray diffraction .Monochromatic X rays are incidents on a crystal.If first order reflection is observed at an angle 3.4∘ ,at what angle would second order reflection be expected.
(8 marks)
00
3.b.
Derive an expression for Hall voltage and Hall coefficient with neat labelled diagram.
(7 marks)
00
4.a.
Differentiate between Type-I and Type-II Superconductors.
(5 marks)
00
4.b.
Discuss in details any three factors affecting acoustics of a hall with their remedies.
(5 marks)
00
4.c.
A quartz crystal of thickness 1mm is vibrating at resonance.Calculate its fundamental frequency (Assume that for quartz,Y = 7.9 X $10^{10}$N/m$^2$ and $\rho=2.650 \mathrm{gm} / \mathrm{cc}$)
(5 marks)
00
5.a.
Define Ligancy.Find the value of critical radius ration for Ligancy 3.
(5 marks)
00
5.b.
For an electron passing through potential difference 'V',show that its wavelength is:$\lambda=\frac{12.26}{\sqrt{V}} \mathrm{A}^{\circ}$
(5 marks)
00
5.c.
What is the probability of an electron being thermally excited to conduction band in Si at 27$^{\circ}$C.The band gap energy is 1.12eV.
(5 marks)
00
6.a.
Explain Point defects in crystals.
(5 marks)
00
6.b.
Show that group velocity of matter waves associated with a particle is equal to the particle velocity (V group = V particle)
(5 marks)
00
6.c.
Explain the principle construction and working of Light Emitting Diode.
(5 marks)
00
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