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Posted By: Rajasekaran Member Level: Silver Posted Date: 17 Dec 2007
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2006 Anna University B.E PH 1101 – PHYSICS – I (Common to all branches of Engineering and Technology) Question paper
B.E/B.Tech.DEGREE EXAMINATION, JANUARY 2006.
First Semester
PH 1101 – PHYSICS – I
(Common to all branches of Engineering and Technology)
(Regulation 2004)
Time: Three hours Maximum: 100 marks
Answer ALL questions
PART A – (1 0*20 20 marks)
1. If the intensity of a source of sound is increased to 20 times its value , by how
many decibel does the intensity level increase?
2. Describe a laboratory experiment to determine the velocity of ultrasonic waves
in a given liquid by forming an acoustic grating.
3. The unit cell edges a, b and c of an orthorhombic crystal are 0.05 nm, 0.04 nm
and 0.03 nm respectively. Of a family of parallel, equidistant planes, the one
that is closest to the origin of the unit cell makes intercepts on the a, b and c
edges at 0.025 nm, 0.02 nm and 0.01nm respectively . Find the Miller indices of
of the set of parallel planes.
4. Mention any four requisites of a good liquid penetrant used in liquid penetrant
non-destructive testing.
5. An air wedge is formed between two glass plates of length 10 cm. Each, with a
fine insulated wire kept between the plates at one end. When illuminated with
sodium light of wavelength 589.3 nm, 100 fringes are seen in 1 cm. With the
insulation removed , 60 fringes are seen in 1 cm. Calculate the diameter of the
wire and the thickness of insulation coating.
6. What is meant by photo elastic effect?
7. The photoelectric effect work function of aluminium is 4.2 eV. Calculate the
kinetic energy of fastest photoelectron when light of wavelength 200 nm is
incident of an aluminium surface ( 1 eV = 1.6 * 10^-19 J; h = 6.62 * 10 ^ -34 Js and
c = 3 * 10 ^ 8 ms ^ -1).
8. Mention the physical significance of wave function of Schrodinger's wave
equation.
9. Mention any four advantages of LED in electronic display.
10. The refractive index of core and cladding materials of an optical fibre are 1.54
and 1.5 respectively. Calculate the numeral aperture of the optical fibre.
PART B – (5 *16 = 80 marks )
11. (i) With a neat diagram, explain the construction and working of CO 2 laser.
(12)
(ii) Mention any four advantages of fibre optic sensors. (4)
12. (a) Derive expressions for growth and decay of energy density inside a hall
and hence deduce Sabine's formula for the reverberation time of the hall. (16)
Or
(b) (i) Draw the circuit diagram of piezo-electric oscillator and explain the
the production of ultrasonic waves using it. (10)
(ii) Explain the application of ultrasonics in SONAR and blood flow
measurement. (3 + 3)
13. (a) (i) Define packing factor and derive an expression for packing factor of
hcp structure. ( 2 + 10)
(ii) Magnesium has hcp structure. The radius of magnesium atom is
0.1605 nm. Calculate the unit cell of magnesium. (4)
Or
(b) (i) Draw the black diagram of an ultrasonic flaw detector and explain
the function of its various components. (5 + 5)
(ii) Explain the tube shift method of finding the depth of a flaw in a
material using X- rays. (6)
14. (a) (i) Describe the construction and working of Michelson's
interferometer. Also explain, with necessary theory, a laboratory
experiment of finding the wavelength of a monochromatic source of
light using Michelson's interferometer. (6 + 6)
(ii) When a thin film of glass of refractive index 1.5 is interposed in the
path of one of the interfering beams of Michelson's interferometer, a
shift of fringes of sodium light is observed across the field of
view. If the thickness of the glass film is 0.018 mm, calculate the
wavelength of the light used. (4)
Or
(b) (i) Explain in details the methods of detecting plane, circularly and
elliptically polarized lights. (4 + 4 +4)
(ii) Calculate the thickness of a mica sheet required for making a
half-wave plate for a light of wavelength 546.1 nm. The indices of
refraction of mica for the ordinary and extraordinary rays for the
given light, respectively are 1.586 and 1.592. (4)
15. (a) (i) Explain Compton effect and derive an expression for the
wavelength of scattered photon. (2 + 10)
(ii) X-rays of wavelength 0.1 nm are scattered from a carbon block.
Find the wavelength of the scattered beam in a direction making an
angle of 90° with the incident beam ( mo = 9.11 * 10 ^ -31 kg). (4)
Or
(b) (i) Derive an expression for energy levels of a particle enclosed in
one – dimensional potential box of width a and infinite height. (12)
(ii) Calculate the least energy that an electron can posses in a
one-dimensional potential box of width 0.5 nm and infinite height.
(m = 9.11 * 10 ^ -31 kg). (4)
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