Swami Ramanand Teerth Marathwada University 2011 B.E Engineering Physics /e, - Question Paper
z—216—2011
FACULTY OF ENGINEERING
F.E. (Gen.) exam
MAY/JUNE, 2011
(New Course)
ENGINEERING PHYSICS
(Saturday, 28-5-2011) Time : 10.00 a.m. to 1.00 p.m.
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Time—Three Hours Maximum Marks—80
N.B. :— (i) Use separate answer-book for every part.
(ii) Question No. one in part A and ques. No. five in part B are compulsory.
(iii)Attempt any 2 other ques. from part A and part B every.
(iv) Non-programmable calculator is allowed.
(v) Figures to the right indicate full marks.
(iii) Explain the phenomena of interference. What is constructive and destructive interference ?
(iv) Explain any two applications of CRO.
(v) What are cathode rays ? Mention their properties.
(a) What is Zeeman effect ? Obtain necessary expression for Zeeman shift. 6
(b) Explain different types of sound absorbing material in
6
detail.
(a) Derive an expression for e/m of an electron using crossed
electric and magnetic field in a cathode ray tube. 6
(b) Define magneto striction effect and Piezoelectric effect. An ultrasonic source of 0.07 MHz sends down a pulse towards the seabed which returns after 0.065 sec. The velocity of sound in sea water is 1700 m/sec. Calculate depth of sea
and the wavelength of pulse.
6
(a) Explain the formation of Newtons ring and show that radii of dark rings are proportional to underroot of natural number. ' 6
(b) Explain Nuclear fission in natural Uranium. 6
Section B
Attempt any four of the following :
16
(i) Define Fresnel and Fraunhofer diffraction and distinguish between them.
(ii) What is Heisenbergs uncertainty principle ?
(iii) State and explain Brewisters law.
(iv) Calculate the numerical aperture, acceptance angle and the critical angle of the fibre having refractive index of core (rej = 1.5) and refractive index of cladding (ra2 = 1.45).
(v) Write any four applications of Laser.
(a) What is the significance of critical temp., critical magnetic field and critical current density for superconductor ? 6
(b) Explain with neat diagram working of Braggs X-ray spectrometer. 6
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