BT-201 (GS) – Engineering Physics
• Attempt any five questions.
• All questions carry equal marks.
a)Unit 1Define phase velocity and group velocity.
Define phase velocity and group velocity.
b)Unit 1Explain uncertainty principle.
Explain uncertainty principle.
c)Unit 1Derive the time independent Schrödinger wave equation.
Derive the time independent Schrödinger wave equation.
a)Unit 2Define path difference and phase difference.
Define path difference and phase difference.
b)Unit 2What should be the minimum number of lines in a grating which will just resolve in the second order, the lines whose wavelengths are 5890Å and 5896Å.
What should be the minimum number of lines in a grating which will just resolve in the second order, the lines whose wavelengths are 5890Å and 5896Å.
c)Unit 2Derive the expression for intensity due to diffraction at a single slit.
Derive the expression for intensity due to diffraction at a single slit.
a)Unit 3Explain the Fermi level shifting in semiconductors.
Explain the Fermi level shifting in semiconductors.
b)Unit 3Discuss the free electron theory of motors.
Discuss the free electron theory of motors.
c)Unit 3Draw the V-I characteristics of Zener diode.
Draw the V-I characteristics of Zener diode.
a)Unit 4Explain the properties of LASER.
Explain the properties of LASER.
b)Unit 4Find the intensity of laser beam of 10 mW power and having diameter of 1.3 mW, assuming the intensity to be uniform across the beam.
Find the intensity of laser beam of 10 mW power and having diameter of 1.3 mW, assuming the intensity to be uniform across the beam.
c)Unit 4Explain the working of Ruby laser with labelled diagram.
Explain the working of Ruby laser with labelled diagram.
a)Unit 5Define gradient of a scalar field and divergence of a vector field.
Define gradient of a scalar field and divergence of a vector field.
b)Unit 5State and prove continuity equation.
State and prove continuity equation.
c)Unit 5State and explain Maxwell's equation in vacuum and non conducting medium.
State and explain Maxwell's equation in vacuum and non conducting medium.
a)Unit 1Discuss the energy and momentum operator.
Discuss the energy and momentum operator.
b)Unit 1Explain the Dual nature of matter.
Explain the Dual nature of matter.
c)Unit 1Prove that for one dimensional motion of a particle in a box ψₙ = A sin(nπx/L).
Prove that for one dimensional motion of a particle in a box ψₙ = A sin(nπx/L).
a)Unit 2Differentiate between division of amplitude and division of wavefront.
Differentiate between division of amplitude and division of wavefront.
b)Unit 2In Newton's ring experiment the diameter of nth and (n+14)th rings are 0.42 cm and 0.70 cm respectively. If the radius of curvature of plano convex lens is 100 cm. Calculate the wavelength of light.
In Newton's ring experiment the diameter of nth and (n+14)th rings are 0.42 cm and 0.70 cm respectively. If the radius of curvature of plano convex lens is 100 cm. Calculate the wavelength of light.
c)Unit 2Explain the Michelson's interferometer experiment on the basis of labelled diagram and types of fringes.
Explain the Michelson's interferometer experiment on the basis of labelled diagram and types of fringes.
a)Unit 4Write down the applications of LASER in Engineering and Medicine.
Write down the applications of LASER in Engineering and Medicine.
b)Unit 4Write down the importance of total internal reflection in optical fiber.
Write down the importance of total internal reflection in optical fiber.
c)Unit 4Calculate the numerical aperture and acceptance angle for an optical fiber, given that the refractive indices of core and cladding are 1.45 and 1.41 respectively.
Calculate the numerical aperture and acceptance angle for an optical fiber, given that the refractive indices of core and cladding are 1.45 and 1.41 respectively.