Advanced Engineering Physics 2022 Question Paper — Government College…
The 2022 Advanced Engineering Physics previous year question paper (Government College of Engineering and Technology, Jammu), with every question and its marks.
- University: Government College of Engineering and Technology, Jammu
- Subject: Advanced Engineering Physics
- Course: APPLIED ENGINEERING PHYSICS
- Year: 2022
- Paper: end-term
- Duration: 180 minutes
- Total marks: 100
Instructions
- Attempt five questions in all selecting at least two questions from each Section.
- Each question carries 20 marks.
- Use of scientific calculator is allowed.
Questions
SECTION-A
- QQ1. (a) Derive wave equations satisfied by $\vec{E}$ and $\vec{B}$ in a free space. Show that EM waves travel with the velocity of light in vacuum. (b) A lamp radiates 50-Watt power uniformly in all directions. Calculate the electric and magnetic field intensities at 10m distance from the lamp. [20 marks]
- QQ2. (a) Explain the construction and working of a Ruby Laser. Explain why a ruby Laser is known as a pulsed Laser. Discuss the characteristics of Lasers. (b) Calculate the energy difference in electron volt between two energy levels of Ne atoms of a He-Ne laser, the transition between which results in the emission of light of wavelength $6328 \text{\AA}$. Also calculate the number of photons emitted per second if the optical output is $2\text{ mW}$. [20 marks]
- QQ3. (a) What was the need for a differential wave equation? Obtain time dependent and time independent forms of Schrodinger's wave equations. (b) Find the probability that a particle in a one dimensional box of length L can be found between $0.4\text{ L}$ to $0.6\text{ L}$ (a) for the ground state (b) for the first excited state [20 marks]
- QQ4. (a) What is Compton effect? Discuss its experimental verification and determine the expression for Compton shift and Compton wavelength. (b) The electric field intensity of a uniform plane wave in air is $8000\text{V/m}$ in the y-axis. The wave is propagating along -axis at a frequency of $10^{10}\text{ rad/sec}$. calculate (a) the wavelength (b) the frequency (c) time period and (d) amplitude of H vector. [20 marks]
SECTION-B
- QQ5. (a) What is Hall effect? Find the expression for the Hall coefficient, Hall voltage and mobility. Mention some important applications of Hall effect. (b) The intrinsic carrier concentration for silicon at room temperature is $10^{10}/\text{cm}^3$. If the mobilities of electrons and holes are $1300\text{ cm}^2/\text{Vs}$ and $450\text{ cm}^2/\text{Vs}$, find the conductivity of silicon at $27^{\circ}\text{C}$? [20 marks]
- QQ6. (a) Explain the phenomenon of double refraction of light and give a description of doubly refracting crystals. Describe the construction of Nicol prism and discuss how it can be used as a polarizer and as an analyzer (b) Newton's rings are observed in reflected light of $\lambda = 5.9 \times 10^{-5}\text{ cm}$. The diameter of 10th dark ring is $0.5\text{ cm}$. Find the radius of curvature of the lens and the thickness of the air film [20 marks]
- QQ7. (a) Define optical fibres. Explain how optical fibres are classified. Discuss their characteristic features and advantage of optical communication over the conventional ones. (b) An optical fibre has a numerical aperture of $0.15$ in air and a cladding refractive index of $1.50$. Find the numerical aperture of the fibre in liquid of refractive index $1.30$. [20 marks]
- QQ8. (a) Define thin films. Obtain the conditions for constructive and destructive interference due to reflection of light in thin films. (b) Find the diffusion coefficients of holes and electrons for germanium at $300\text{ K}$. The carrier mobilities in $\text{cm}^2/\text{Vs}$ at room temperature for electrons and holes are $3600$ and $1700$ respectively. Density of carriers is $2.5\times10^{13}/\text{cm}^2$. Use Boltzmann constant= $1.38\times 10^{-23}\text{ J/K}$ [20 marks]