€ २१
REFERENCE

B 818001 1 Total Pages:2

Reg. No. Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST SEMESTER B TECH DEGREE EXAMINATION JANUARY 2017

Course Code: PH 100
Course Name: ENGINEERING PHYSICS

Maximum Marks : 100 Duration : 3 hours

PART A
Answer all questions. Each question carries 2 marks

What is resonance in forced oscillation? Give one example.

Distinguish between transverse and longitudinal waves with examples.

What are coherent sources?

Why diffraction of light is not as evident in daily experience as that of sound waves?
What are positive and negative uniaxial crystals?

Define critical magnetic field in superconductors? How this is related to the temperature

ಛಾ = = ene

of superconductor?
7. What is meant by wave function? Write its normalization condition.
8. What are bosons and fermions? Give examples.
9. Define reverberation and reverberation time.
10. Mention any two medical applications of ultrasonic waves.
11. What is a laser? What are the three requisites for laser action to take place?
12. Distinguish between an LED and a semiconductor laser.
PART B
Answer any 10 questions. Each question carries 4 marks

13. What is a damped harmonic oscillator? Draw the graph showing the variation of
amplitude with time in case of over damped, critically damped and under damped case of
an oscillator by clearly marking the conditions for the above cases in the graph itself.

14. The equation of a transverse vibration of a stretched string is given by

y=1.5x1073sin (Fx - 8070)
Where x is measured in metres and t in seconds. Evaluate (i) Amplitude (ii) Wavelength
(111) Frequency and (iv) Velocity of wave?

15. If the diameter of ‏"لم‎ dark ring in an arrangement giving Newton’s rings changes from
0.03m to 0.025m as a liquid is introduced between the lens and plate, what is the value of
refractive index of the liquid?

16. A parallel beam of monochromatic light of wavelength 589.6 nm from a narrow slit is
diffracted by a plane transmission grating containing 6000 lines/cm, placed normal to the
beam. Calculate the angle at which the second order diffracted images of the slits will be
observed.

Page 1 of 2