# Question Bank Solutions for BE Mechanical Engineering Semester 2 (FE First Year) - University of Mumbai - Applied Physics 2

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Applied Physics 2
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Differentiate between spontaneous and stimulated emission.

[8] Lasers
Chapter: [8] Lasers
Concept: Spontaneous Emission and Stimulated Emission

⦁ 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.

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

What is a divergence of a vector field? Express it in cartesian co-ordinate system.

[10] Electrodynamics
Chapter: [10] Electrodynamics
Concept: Scaler and Vector Field

An electron is accelerated through a potential difference of 5 kV and enters a uniform magnetic field of 0.02 (wb)/(m^2) acting normal to the direction of electron motion.

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

Find the divergence of vector field F=x2yz𝒊 ̅+ xz𝒋̅

[10] Electrodynamics
Chapter: [10] Electrodynamics
Concept: Scaler and Vector Field

What is difference between Bottom up and Top Down Approach with respect to Nanotechnology.

[12] Nanoscience and Nanotechnology
Chapter: [12] Nanoscience and Nanotechnology
Concept: Two Main Approaches in Nanotechnology

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

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

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.

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

What is population inversion? Explain it’s significance in the operation of LASER.

[8] Lasers
Chapter: [8] Lasers
Concept: Spontaneous Emission and Stimulated Emission > Population Inversion

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

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

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.

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

A parallel beam of light of wavelength 5890 A0 is incident on a glass plate having refractive index 𝝁=𝟏.𝟓 such that the angle of refraction in the plate is 600. Calculate the smallest thickness of the glass plate which will appear dark by reflected light.

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

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

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

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

[8] Lasers
Chapter: [8] Lasers
Concept: Spontaneous Emission and Stimulated Emission > Pumping

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

[10] Electrodynamics
Chapter: [10] Electrodynamics
Concept: Curl and Divergence

Why the Newton’s rings are circular and fringes in wedge shaped film are straight?

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

Why the Newton’s rings are circular and fringes in wedge shaped film are straight?

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

With Newton’s ring experiment explain how to determine the refractive index of liquid.

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

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

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

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

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