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Question Paper: Engineering Physics 1 Question Paper - May 2013 - First Year Engineering (Semester 1) - Anna University (AU)
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## Engineering Physics 1 - May 2013

### AU First Year Engineering (Semester 1)

Total marks: --
Total time: --

INSTRUCTIONS :--
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1. What is cavitations? 2 marks

2. Why can loudspeaker not be used to produce ultrasonic? 2 marks

3. Calculate the wavelength of radiation emitted by an LED made up of a semiconducting material with a band gap energy 2.8 eV . 2 marks

4. What are the advantages of oxygen assisted laser cutting? 2 marks

5. What are the conditions to be satisfied for total internal reflection? 2 marks

6. The refractive index of core and cladding are 1.60 and 1.49 respectively. Calculate the critical angle at core-cladding interface. 2 marks

7. Mention the physical significance of wave function? 2 marks

8. Define blackbody. 2 marks

9. Determine the distance between adjacent atoms of platinum which has an FCC structure a= 3.923 Å . 2 marks

10. Define Burger vector. 2 marks

### Answer any one question from Q11.(a) & Q11.(b)

11. (a) What is magnetostrictive effect? Describe with principle the magnetostriction method of producing ultrasonic. 16 marks

11.(b) Briefly explain the three types of non-destructive testing method using ultrasonic with a neat diagram. 16 marks

### Answer any one question from Q12.(a) & Q12.(b)

12. (a) Explain the principle, construction and working of $CO_ 2$ laser. 16 marks

12. (b) Explain holography. How will you create a hologram of an object and recreate the image of the original object? 16 marks

### Answer any one question from Q13.(a) & Q13.(b)

13. (a) Explain in detail the classification of optical fibre. 16 marks

13. (b) Describe the principle of fibre optic sensors. Explain fibre optic displacement sensor and fibre optic temperature sensor. 16 marks

### Answer any one question from Q14.(a) & Q14.(b)

14. (a) Derive time independent Schrodinger wave equation. 16 marks

14. (b) Explain in detail about the principle, construction and working of scanning electron microscope. 16 marks

### Answer any one question from Q15.(a) & Q15.(b)

15.(a) Define packing factor. Finding the packing factor for HCP structure. 16 marks

15. (b)What is meant by crystal defect? Explain the various types of crystal defects with neat diagram. 16 marks

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