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Applied Physics 2 CBCGS 2017-2018 BE Mechanical Engineering Semester 2 (FE First Year) Question Paper Solution

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Applied Physics 2
CBCGS
2017-2018 June
Marks: 60

1) Question no is compulsory . 

2) Attempt any three question from no . Q . 2 to Q . 6 .


[15]1
[3]1.a

Explain how interference in wedge shaped film is used to test optical flatness of given glass plate.

Chapter: [7] Interference and Diffraction of Light
Concept: Wedge Shaped Film(Angle of Wedge and Thickness Measurement)
[3]1.b

What is diffraction grating? What is the advantage of increasing the number of lines in the grating? 

Chapter: [7] Interference and Diffraction of Light
Concept: Diffraction Grating
[3]1.c

With neat ray diagram explain the concept of total internal reflection (TIR). 

Chapter: [9] Fibre Optics
Concept: Total Internal Reflection
[3]1.d

Differentiate between spontaneous and stimulated emission.

Chapter: [8] Lasers
Concept: Spontaneous Emission and Stimulated Emission
[3]1.e

Find cylindrical co-ordinates of a point (3𝒊̅ + 4𝒋̅ + 𝒌̅) 

Chapter: [10] Electrodynamics
Concept: Cylindrical and Spherical Coordinate System
[3]1.f

In Newtons’s ring experiment,what will be the order of dark ring which will have double the diameter of 40th dark ring? 

Chapter: [7] Interference and Diffraction of Light
Concept: Newton’S Rings
[3]1.g

Draw the block diagram of cathode ray tube and briefly explain its parts. 

 

Chapter: [11] Charge Particle in Electric and Magnetic Fields
Concept: Cathode Ray Tube (Crt)
[15]2
[8]2.a

Derive the conditions of maxima and minima due to interference of light reflected from thin film of uniform thickness.

Chapter: [7] Interference and Diffraction of Light
Concept: Interference in Thin Film of Constant Thickness Due to Reflected and Transmitted Light
[7]2.b

Derive the formula for numerical aperture of step index fibre and give it’s physical significance.The N.A of of an optical fibre is 0.5 and the core refractive index is 1.54.Find the refractive index of cladding.

Chapter: [9] Fibre Optics
Concept: Numerical Aperture
[15]3
[8]3.a

Discuss the Fraunhoffer diffraction at single slit and obtain the condition for minima.
In plane transmission grating the angle of diffraction for second order principal maxima for wavelength 5 x 10-5 is 35o. Calculate number of lines/cm for this diffraction grating. 

Chapter: [7] Interference and Diffraction of Light
Concept: Diffraction Grating
[7]3.b

What is the difference between photography and holography?
Explain holography technique to obtain 3D image of an object. 

Chapter: [8] Lasers
Concept: Applications of Laser - Holography (Construction and Reconstruction of Holograms)
[15]4
[5]4.a

Find the divergence of vector field F=x2yz𝒊 ̅+ xz𝒋̅

Chapter: [10] Electrodynamics
Concept: Scaler and Vector Field
[5]4.b

Explain how A.C voltage and its frequency is measured using CRO.

Chapter: [11] Charge Particle in Electric and Magnetic Fields
Concept: Application of Cro
[5]4.c

A wedged shaped air film having an angle of 40 seconds is illuminated by monochromatic light and fringes are observed vertically through a microscope. The distance measured between consecutive fringes is 0.12 cm. Calculate wavelength of light used.

Chapter: [7] Interference and Diffraction of Light
Concept: Wedge Shaped Film(Angle of Wedge and Thickness Measurement)
[15]5
[5]5.a

Explain Newton’s ring experiment and show that diameters of nth dark rings are proportional to square root of natural numbers.

Chapter: [7] Interference and Diffraction of Light
Concept: Newton’S Rings
[5]5.b

Write Maxwell’s equation and give its physical significance.

Chapter: [10] Electrodynamics
Concept: Determination of Maxwell’S Four Equations
[5]5.c

Explain construction and working of atomic force microscope.

Chapter: [12] Nanoscience and Nanotechnology
Concept: Important Tools in Nanotechnology - Atomic Force Microscope
[15]6
[5]6.a

Explain different types of carbon nanotubes and give its applications.

Chapter: [12] Nanoscience and Nanotechnology
Concept: Nano Materials - Properties and Applications of Nanomaterials
[5]6.b

Explain construction and working of Nd:YAG LASER. 

Chapter: [8] Lasers
Concept: Spontaneous Emission and Stimulated Emission - Nd:Yag Lase
[5]6.c

Write a note on electrostatic focusing.

Chapter: [11] Charge Particle in Electric and Magnetic Fields
Concept: Electrostatic Focusing

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