PH 2111 Engineering Physics - I B.E B.Tech DEGREE EXAMINATION NOV DEC 2009 Question Paper

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Anna University, Chennai.

B.E/B.Tech. DEGREE EXAMINATION, NOV/DEC. 2009

First Semester 

PH 2111 - Engineering Physics - I 

(Common to all branches)

Time: 3 hours 

Maximum: 100 marks

PART -A(10*2=20 MARKS)

1.Calculate the frequency of ultrasonic waves that can be generated by a nickel rod of length 4cm.(Young's modulus of nickel=207Gpa and density of nickel 8900 kg/m^3).
2.Write a note on cavitations.
3.Give the principle of semiconductor diode laser.
4.Mention any four applications of laser in medicine.
5.Define acceptance angle in optical fiber communication?
6.What are the types of sensors used in fiber optic communication?
7.In Compton scattering,the incident photon have a wavelength 0.5nm. Calculate the wavelength of scattered radiation if they are viewed at angle of 45 degree to the direction of incidence.
8.Explain the principle of transmission of electron microscope.
9.Differentiate polymorphism and allotropy.
10.Write a short note on Burger vector.

PART –B(5*16=80 MARKS)
11.(a)(i)Write down the properties of ultrasonic waves.
(ii)Describe the principle,construction and working of piezo-electric oscillator.
Or
(b)(i)Describe the various non-destructive testing methods.
(ii)Explain the type of ultrasonic imaging systems.
12.(a)(i)What is spontaneous and stimulated emission?
(ii)Write down the conditions for population inversion.
(iii)What is pumping action? Explain the methods commonly used for pumping action.
Or
(b)(i)Explain the construction and reconstruction of a hologram.
(ii)In detail explain the principle,construction and working of a four level solid state laser.
13.(a)(i)Explain in detail the losses in optical fiber with basic attenuation mechanisms.
(ii)Give the advantages of fiber-optic communication.
Or
(b)(i)Find the numerical aperture and the acceptance angle of an optical fiber whose core has a refractive index of 1.5(Refractive index of cladding-1.447 and refractive index of air=1).
(ii)What is the principle of fiber optics?
(iii)Explain the various types of optical fibers.
14.(a)(i)Explain planck's hypothesis.
(ii)State and derive Planck's law of Radiation.
Or

(b)(i)Derive Schrodinger's time dependent and time independent wave equations.
(ii)Write a note on Black body radiation.
15.(a)(i)What is packing factor?Prove that the packing factor of HCP crystal structure is 0.74.
(ii)Explain the crystal structures of
(1)NaCl
(2)ZnS
(3)Diamond
(4)Graphite
Or
(b)Explain in detail the crystal defects and their types.

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