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

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Applied Physics 2 [CBCGS]
Marks: 60 Academic Year: 2017-2018
Date: December 2017
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1) Question no is Compulsary .

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

[15]1 | Attempt any five of the following
[3]1.A

Why the Newton’s rings are circular and centre of interference pattern (reflected) is dark?

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

What is Rayleigh’s criterion of resolution? Define resolving power of grating?

Concept: Resolving Power of a Grating
Chapter: [7] Interference and Diffraction of Light
[3]1.C

Calculate the V number of an optical fibre having numerical aperture 0.25 and core diameter 20 μm, if its operating wavelength is 1.55 μm.

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

What is pumping in LASER? Give the types of pumping.

Concept: Spontaneous Emission and Stimulated Emission - Pumping
Chapter: [8] Lasers
[3]1.E

Show that the divergence of curl of a vector is zero.

Concept: Curl and Divergence
Chapter: [10] Electrodynamics
[3]1.F

⦁ Determine the magnetic field required to bend a beam consisting of electrons of speed 3  × 10 m/s in a circle of radius 5 cm.

Concept: Motion of Electron in Magnetic Field
Chapter: [11] Charge Particle in Electric and Magnetic Fields
[3]1.G

What will be the fringe pattern if wedge shaped air film is illuminated with white light?

Concept: Wedge Shaped Film(Angle of Wedge and Thickness Measurement)
Chapter: [7] Interference and Diffraction of Light
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[15]2
[8]2.A

Obtain the condition for maxima and minima of the light reflected from a thin transparent film of uniform thickness. Why is the visibility of the fringe much higher in the reflected system than in the transmitted system.

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

What is Numerical aperture? Explain the use of optical fibre in temperature sensor. The core diameter of a multimode step index fibre is 50 μm. The numerical aperture is 0.25. Calculate the number of guided modes at an operating wavelength of 0.75 μm.

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

Explain the experimental method to determine the wavelength of spectral lines using grating. A diffraction grating has 5000 lines / cm and the total ruled with is 5cm. Calculate dispersion for a wavelength of 5000 A0 in the second order.

Concept: Application of Diffraction - Determination of Wavelength of Light with a Plane Transmission Grating
Chapter: [7] Interference and Diffraction of Light
[7]3.B

Explain construction and working of Nd: YAG laser.

Concept: Spontaneous Emission and Stimulated Emission - Nd:Yag Lase
Chapter: [8] Lasers
[15]4
[5]4.A

Explain spherical co-ordinate system. State the transformation relation between Cartesian and spherical co-ordinates.

Concept: Cylindrical and Spherical Coordinate System
Chapter: [10] Electrodynamics
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[5]4.B

Explain construction and working of cathode ray tube.

Concept: Cathode Ray Tube (Crt)
Chapter: [11] Charge Particle in Electric and Magnetic Fields
[5]4.C

A wedge shaped air film having angle 40 seconds is illuminated by monochromatic light. Fringes are observed vertically through a microscope. The distance between 10 consecutive dark fringes is 1.2 cm. find the wavelength of monochromatic light used.

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

With neat diagram explain construction and working of atomic force microscope.

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

Derive Maxwell’s two general equations in integral and differential form.

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

an electron is accelerated through a potential difference of 5kv and enters a uniform magnetic field of 0.02 wb/m2 acting normal to the direction of electron motion. Determine radius of the path.

Concept: Motion of Electron in Electric Field
Chapter: [11] Charge Particle in Electric and Magnetic Fields
[15]6
[5]6.A

What are the different techniques to synthesise nanomaterial? Explain one of them in detail.

Concept: Nano Materials - Methods to Synthesize Nanomaterials
Chapter: [12] Nanoscience and Nanotechnology
[5]6.B

What is holography? Differentiate between holography and photography.

Concept: Applications of Laser - Holography (Construction and Reconstruction of Holograms)
Chapter: [8] Lasers
[5]6.C

Describe in detail the concept of anti-reflecting film with a proper ray diagram.

Concept: Anti-reflecting Films and Highly Reflecting Film
Chapter: [7] Interference and Diffraction of Light

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