# Question Bank Solutions for BE Biotechnology 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.

 Lasers
Chapter:  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.

 Charge Particle in Electric and Magnetic Fields
Chapter:  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.

 Electrodynamics
Chapter:  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.

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

Find the divergence of vector field F=x2yz𝒊 ̅+ xz𝒋̅

 Electrodynamics
Chapter:  Electrodynamics
Concept: Scaler and Vector Field

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

 Nanoscience and Nanotechnology
Chapter:  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?

 Interference and Diffraction of Light
Chapter:  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.

 Interference and Diffraction of Light
Chapter:  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.

 Lasers
Chapter:  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.

 Interference and Diffraction of Light
Chapter:  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.

 Interference and Diffraction of Light
Chapter:  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.

 Interference and Diffraction of Light
Chapter:  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?

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

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

 Lasers
Chapter:  Lasers
Concept: Spontaneous Emission and Stimulated Emission > Pumping

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

 Electrodynamics
Chapter:  Electrodynamics
Concept: Curl and Divergence

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

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

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

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

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

 Interference and Diffraction of Light
Chapter:  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?

 Interference and Diffraction of Light
Chapter:  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.

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