B

B2B013

Reg. No. Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
SECOND SEMESTER B TECH DEGREE EXAMINATION, MAY 2017

PH 100: ENGINEERING PHYSICS

Max. Marks: 100 Duration: 3 hours

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PART ^
Answer all questions. Each question carries 2 marks.

Explain two practical cases of damping.

Distinguish between longitudinal waves and transverse waves.

How can you test the planeness of surfaces using an air wedge?
Distinguish between Fresnel and Fraunhofer diffraction.

What is a half wave plate? Write the equation for its thickness.

What is Meissner effect?

Give the probability interpretation of the wave function.

What are bosons and fermions? Give examples.

What is absorption coefficient of sound?

. What is inverse piezoelectric effect?
. Explain population inversion and metastable level in a laser.
. What is an avalanche photodiode?

PART B

Answer any 10 questions. Each question carries 4 marks.

. Derive an equation for the velocity of propagation of the waves for transverse

vibrations of a stretched string.

. In 8 Newton’s rings experiment the diameters of the 4" and 12"dark rings are 0.4 cm

and 0.7 cm respectively. Find the diameter of the 20" dark ring.

. Derive the differential equation of damped harmonic oscillation.
. ^ plane transmission grating having 5 x 10° lines per metre is used at normal

incidence. Calculate the angular separation, in the second order, between the two
sodium lines of wavelengths 589 nm and 589.6 nm.

. Describe the experimental procedure for producing circularly and _ elliptically

polarized light.

. What is a SQUID? Mention some important applications of SQUIDs.
. Explain the absence of electrons in the nucleus on the basis of the uncertainty

principle.

. What are the important postulates of Maxwell-Boltzmann statistics?

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