May 2005 (for ME)

Sree Narayana Guru College of Engineering and Technology, Payyanur
Improvement test - May 2005

EN2K 103B : ENGINEERING PHYSICS(B)
(For ME)

Time: 2Hours Marks: 50

Part A: Answer all questions

1 Describe stress-optic law
2 Explain Laue’s experiments on X-ray diffraction and mention its significance
3 What is the significance of reverberation time in the design of an auditorium
4 Obtain the expressions for Einstein coefficients
(4x5=20)

Part B: Answer three questions

5 Explain the working of ruby laser and semiconductor diode laser (10 Marks)

OR

6 (a) What is a hologram? What are the special features of a hologram over a photograph? (5 Marks)
(b) Calculate the energy difference in eV between two energy levels of neon atoms of a He-Ne gas laser, the transition between which results in the emission of light of wavelength 632.8nm (5 Marks)

7 Define standard time of reverberation. Derive Sabine’s formula for the standard time of reverberation. Mention the assumptions made. (10 Marks)

OR

8 Write notes on the following
(a) Radiographic method of nondestructive testing (3 Marks)
(b) Ultrasonic method of nondestructive testing (7 Marks)


9 Derive Bragg’s law of X-ray diffraction. Explain Bragg’s X-ray spectrometer and how will you determine the wavelength of light used (10 Marks)

OR

10 What is piezoelectric effect? Explain with a circuit diagram, the generation of ultrasonics using a piezoelectric oscillator. What are the important applications of ultrasonics (10 Marks)