Engineering Physics - Apr 2013

First Year Engineering (Semester 1)

TOTAL MARKS:
TOTAL TIME: HOURS

Answer any one question from Q1 & Q2

1 (a) Explain the formation Newton's ring with diagram and drive the diameter of bright ring.(6 marks) 1 (b) Discuss the use of ultrasonics for flaw Detection.(3 marks) 1 (c) A auditorium of volume 5500m³ is found to have reverberation time 2.5 secs. The sound absorbing surface of the auditorium has an area of 750m². Calculate the average absorption coefficient of the auditorium.(3 marks) 2 (a) Define magnetostriction effect. Explain how magnetostriction oscillator is used to produce ultrasonic waves with the help of neat circuit diagram.(6 marks) 2 (b) Explain with diagram how interference Principle is used to design anti reflection caoting.(3 marks) 2 (c) Monochromatic light from He-Ne laser source (λ = 6328Å) is incident normally on a diffraction grating having 6000lines/cm. Find the angle at which one would observe second order maximum.(3 marks)

Answer any one question from Q3 & Q4

3 (a) Define Double refraction. Explain Huygen's Theory of Double refracting crystal with diagram.(6 marks) 3 (b) Define Fermi level. Plot the variation of Fermi level with the increase of temperature for n-type and p-type semiconductor.(3 marks) 3 (c) Calculate the conductivity of Ge sample if the donor impurity is added to an extent of one part in 10⁸ Ge atoms at room temperature. (Data Given: N_a=6.023×10²³ atoms/gm mole. At Wt. of Ge=72.6 Density of Ge=5.32 gm/cc., µ=3800 cm²/v-s.)(3 marks) 4 (a) Define Hall effect. Derive the expression of Hall coefficient, Hall Voltage and discuss their applications.(6 marks) 4 (b) Explain the process of recording Hologram with the help of LASER.(3 marks) 4 (c) At what angle of incidence should a beam of sodium light be directed upon the surface of diamond crystal to produce complete polarized light (Data Given: Critical angle for diamond=24.5°).(3 marks)

Answer any one question from Q5 & Q6

5 (a) Derive Schroedinger time independent wave equation.(6 marks) 5 (b) Define phase velocity, Group velocity and Derive their expressions.(4 marks) 5 (c) Calculate the De-Broglie wavelength associated with 1 Mev proton (m_p=1.67×10^-27 kg.).(3 marks) 6 (a) Explain Heisenberg Uncertainty Principle and prove this principle using single slit Diffraction experiment.(6 marks) 6 (b) Calculate the energy and momentum of an electron confined in a rigid box of width 2Å for lowest energy state.(4 marks) 6 (c) Does the matter waves are electromagnetic waves? Explain.(3 marks)

Answer any one question from Q7 & Q8

7 (a) Explain the synthesis of nanoparticles through colloidal route with diagram.(6 marks) 7 (b) Differentiate between Type-I and Type-II Superconductor with diagram.(4 marks) 7 (c) Explain two application of Superconductivity.(4 marks) 8 (a) Explain Meissner effect and Critical magnetic field for superconductivity.(6 marks) 8 (b) Explain the optical and electrical properties of na Noparticles.(4 marks) 8 (c) Explain the applications of nanoparticle in medical and electronic industry.(3 marks)