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M 20999
Cornbined First and Second Semester B.Tech. (lnc[uding Part Time) Degre
(Reg./Sup-llmp,) Examination, April 2012
pAAT Admn. Onwards)
PT2K6|2KG EN 192: ENGINEERING PHYSICS
Time : 3 Hours
lnstructions: i) Answer all questions.
ii) Assume suitable datathat are not given.
Max. Marks :100
t . a) Two independenton-coherent sources of light cannot produce an interference
pattern. Explain.
b) What is a polarised light ? Explain how to distinguish unpolarised light from
circularly polarised light.
c) Briefly explain the principle behind ESR"
d) Explain a wave function.
e) Discuss the requisites of laser action.
f) Explain how light is guided through an optical fiber,
g) Briefly discuss the properties of superconductors.
h) Classify conductors, semiconductors and insulators on the basis of band
structure. (8x5=40)
a) i) What is a diffraction grating ? Obtain the expression of primary maxima
in a diffraction grating. 10
ii) A plane diffraction grating has the grating constant 15x10-4 cm. Calcualte
the position of 3'd order maxima for I = 2.4x10-4 cm. 5
OR
b) i) Obtain the expression for colours of thin films in a reflected system. 10
ii) A wedge shaped an film having an angle of 40 second, is illuminated by
monochromatic light. The fringes are observed veftically up and the distance
measured between consecutive brighi fringes is 0. 12 cm.Calculate the
wavelength of light used.
,.r.o1
il.
M 20999
lll. a) i) Set up Schrodinger's time independent equation for a particle in a one
dimensional Potential well.
ii) The inherent uncertainty in the measurement oftime spent by iridium
191 nuclein the excited state is found to be 1 .4x10-10 sec. Estimate
the uncertainty that results in its energy in the excited state.
OR
b) i) With basic principlexplain the experimentdl method of detection of ESR. '1
ii) An electron is bound in an one dimensional potential well of width 1 A, but of
infinite height. Find the energy valve in the ground state and 3'd excited
state.
lV. a) i) With an energy level diagram and principlexplain the construction and
working of a semiconductor laser.
ii) The numerical aperture of an optical fibre is 0.2 when surrounded by an
determinal refractive index of core. Also find the acceptance angle when it is
in a aredium of refractive index 1.33. Given refractive index of cladding 1 .59.
OR
b) i) What is non-destructive testing ? Explain with principle and sketch a non
destructive method of testing a sample using ultrasonics"
ii) The ultrasonic pulse echo method is employed to detect possible defects in a
steel bar of thickness 40 cm. lf the pulse interval times are 30 and 80 tts.
Find the distance of the defect from the end of the bar at which the ultrasonic
pulse enters.
V. a) i) What is Hall effect ? Explain how carrier concentration ofa semiconducting
material is determined experimentally.
ii) Write a note on Josephson effect in superconductors.
OR
b) i) Discuss energy density of states in a conductor. Explain Fermi distribution
of electrons in energY states.
ii) A uniform silver wire has a resistivity of 1.54x10{ cm at room temperature.
For an electric field along the wire of 1V/cm, calculate
a) Drift velocitY b) MobilitYGiven
relaxation time of electrons T = 3.98x104 secs.
M 20999
Cornbined First and Second Semester B.Tech. (lnc[uding Part Time) Degre
(Reg./Sup-llmp,) Examination, April 2012
pAAT Admn. Onwards)
PT2K6|2KG EN 192: ENGINEERING PHYSICS
Time : 3 Hours
lnstructions: i) Answer all questions.
ii) Assume suitable datathat are not given.
Max. Marks :100
t . a) Two independenton-coherent sources of light cannot produce an interference
pattern. Explain.
b) What is a polarised light ? Explain how to distinguish unpolarised light from
circularly polarised light.
c) Briefly explain the principle behind ESR"
d) Explain a wave function.
e) Discuss the requisites of laser action.
f) Explain how light is guided through an optical fiber,
g) Briefly discuss the properties of superconductors.
h) Classify conductors, semiconductors and insulators on the basis of band
structure. (8x5=40)
a) i) What is a diffraction grating ? Obtain the expression of primary maxima
in a diffraction grating. 10
ii) A plane diffraction grating has the grating constant 15x10-4 cm. Calcualte
the position of 3'd order maxima for I = 2.4x10-4 cm. 5
OR
b) i) Obtain the expression for colours of thin films in a reflected system. 10
ii) A wedge shaped an film having an angle of 40 second, is illuminated by
monochromatic light. The fringes are observed veftically up and the distance
measured between consecutive brighi fringes is 0. 12 cm.Calculate the
wavelength of light used.
,.r.o1
il.
M 20999
lll. a) i) Set up Schrodinger's time independent equation for a particle in a one
dimensional Potential well.
ii) The inherent uncertainty in the measurement oftime spent by iridium
191 nuclein the excited state is found to be 1 .4x10-10 sec. Estimate
the uncertainty that results in its energy in the excited state.
OR
b) i) With basic principlexplain the experimentdl method of detection of ESR. '1
ii) An electron is bound in an one dimensional potential well of width 1 A, but of
infinite height. Find the energy valve in the ground state and 3'd excited
state.
lV. a) i) With an energy level diagram and principlexplain the construction and
working of a semiconductor laser.
ii) The numerical aperture of an optical fibre is 0.2 when surrounded by an
determinal refractive index of core. Also find the acceptance angle when it is
in a aredium of refractive index 1.33. Given refractive index of cladding 1 .59.
OR
b) i) What is non-destructive testing ? Explain with principle and sketch a non
destructive method of testing a sample using ultrasonics"
ii) The ultrasonic pulse echo method is employed to detect possible defects in a
steel bar of thickness 40 cm. lf the pulse interval times are 30 and 80 tts.
Find the distance of the defect from the end of the bar at which the ultrasonic
pulse enters.
V. a) i) What is Hall effect ? Explain how carrier concentration ofa semiconducting
material is determined experimentally.
ii) Write a note on Josephson effect in superconductors.
OR
b) i) Discuss energy density of states in a conductor. Explain Fermi distribution
of electrons in energY states.
ii) A uniform silver wire has a resistivity of 1.54x10{ cm at room temperature.
For an electric field along the wire of 1V/cm, calculate
a) Drift velocitY b) MobilitYGiven
relaxation time of electrons T = 3.98x104 secs.
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