Engineering FE Engineering Common Sem 2 Engineering Physics II May 2019 R16 Question Paper - Mumbai University | munotes
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Questions asked in this paper
- (4) Figures to the right indicate marks
(2 Hours) [Total Marks: 60]
N.B.: (1) Question No. | is compulsory
(2) Attempt any three questions from remaining Question No’s 2 to 6
(4) Figures to the right indicate marks
1. Attempt any Five (15M)
a) Explain the formation of colors in thin film when it is exposed to white light
b) Write the formula for dispersive power of the grating. Explain how it can be increased
c) A bare core optical fiber with no cladding is kept in air medium and has fractional index difference
of 1.2 %. Calculate acceptance angle of the fibre
d) Differentiate between photography and holography
e) Using cylindrical coordinate system, calculate volume of the cylinder of radius r and height h
f) An electron is accelerated through a potential difference of 18 kV in a cathode ray tube. Calculate
kinetic energy and speed of the electron
g) Explain top down and bottom up approaches to prepare nanomaterials
a. What is anti-reflection coating? State the conditions for refractive index and thickness of the film in
order to act as anti-reflection coating
White light is sent vertically downward onto a horizontal thin film that is sandwiched between the
materials. The indices of the refraction are 1.8 for top material, 1.65 for thin film and 1.50 for the
bottom material. The film thickness is m. Which are the visible wavelengths (400 -700 nm)
those results in fully constructive interference at an observer above the film? (8M)
b. Give the advantageous of optical fiber cables on conventional electrical cables. Calculate core
radius required for an optical fibre to act as a single mode fibre if its core refractive index is 1.46
and cladding refractive index is 1.455 and operating wavelength is 1300 nm. (7M)
a. Explain Fraunhofer’s double slit diffraction experiment and obtain expression for resultant intensity
of light on the screen and derive the formula for missing orders in the double slit diffraction pattern
b. With energy level diagram explain the construction and working of He-Ne Laser. (7M)
a. Calculate divergence of the vector field F = . (5M)
b. Draw the block diagram of cathode ray oscilloscope (CRO) and explain the importance of time base
c. Interference fringes are produced by monochromatic light falling normally on a wedge shaped film
of refractive index 1.4. The angle of wedge is 20 seconds of an arc and the distance between
successive bright fringes is 0.25 cm. Calculate wavelength of the light used. (5 M)
a. Write Maxwell’s equations in differential form and give their physical significance. (5M)
b. The ground state and excited state of the laser is separated by 1.8 eV. Calculate the ratio
of number of atoms in the excited state to the ground state and wavelength of the radiation
c. Explain construction and working of atomic force microscope (AFM). (5 M)
a. Explain sputtering method for synthesis of nano materials. (5M)
b. Explain experimental arrangement of Newton’s rings experiment and show that diameters of dark
rings are proportional to square root of natural numbers. (5 M)
c. Anelectron enters in a uniform magnetic field B = 0.23x at angle to B. Determine
radius and pitch of the helical path. Assume electron speed to be 3x10’ m/sec. (5 M)
N.B.: (1) Question No. | is compulsory
(2) Attempt any three questions from remaining Question No’s 2 to 6
(4) Figures to the right indicate marks
1. Attempt any Five (15M)
a) Explain the formation of colors in thin film when it is exposed to white light
b) Write the formula for dispersive power of the grating. Explain how it can be increased
c) A bare core optical fiber with no cladding is kept in air medium and has fractional index difference
of 1.2 %. Calculate acceptance angle of the fibre
d) Differentiate between photography and holography
e) Using cylindrical coordinate system, calculate volume of the cylinder of radius r and height h
f) An electron is accelerated through a potential difference of 18 kV in a cathode ray tube. Calculate
kinetic energy and speed of the electron
g) Explain top down and bottom up approaches to prepare nanomaterials
a. What is anti-reflection coating? State the conditions for refractive index and thickness of the film in
order to act as anti-reflection coating
White light is sent vertically downward onto a horizontal thin film that is sandwiched between the
materials. The indices of the refraction are 1.8 for top material, 1.65 for thin film and 1.50 for the
bottom material. The film thickness is m. Which are the visible wavelengths (400 -700 nm)
those results in fully constructive interference at an observer above the film? (8M)
b. Give the advantageous of optical fiber cables on conventional electrical cables. Calculate core
radius required for an optical fibre to act as a single mode fibre if its core refractive index is 1.46
and cladding refractive index is 1.455 and operating wavelength is 1300 nm. (7M)
a. Explain Fraunhofer’s double slit diffraction experiment and obtain expression for resultant intensity
of light on the screen and derive the formula for missing orders in the double slit diffraction pattern
b. With energy level diagram explain the construction and working of He-Ne Laser. (7M)
a. Calculate divergence of the vector field F = . (5M)
b. Draw the block diagram of cathode ray oscilloscope (CRO) and explain the importance of time base
c. Interference fringes are produced by monochromatic light falling normally on a wedge shaped film
of refractive index 1.4. The angle of wedge is 20 seconds of an arc and the distance between
successive bright fringes is 0.25 cm. Calculate wavelength of the light used. (5 M)
a. Write Maxwell’s equations in differential form and give their physical significance. (5M)
b. The ground state and excited state of the laser is separated by 1.8 eV. Calculate the ratio
of number of atoms in the excited state to the ground state and wavelength of the radiation
c. Explain construction and working of atomic force microscope (AFM). (5 M)
a. Explain sputtering method for synthesis of nano materials. (5M)
b. Explain experimental arrangement of Newton’s rings experiment and show that diameters of dark
rings are proportional to square root of natural numbers. (5 M)
c. Anelectron enters in a uniform magnetic field B = 0.23x at angle to B. Determine
radius and pitch of the helical path. Assume electron speed to be 3x10’ m/sec. (5 M)
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