S3/UG2/6/A16 Reg. No

St. Joseph’s College of Arts & Science (Autonomous) St. Joseph’s College Road, Cuddalore – 607001 APH301 – ALLIED PHYSICS

Time : 3 hrs

Max Marks :75 SECTION – A (10X2=20) Answer ALL Questions

1. State Newton’s formula for velocity of sound in air/gas medium. 2. What do you mean by ultrasonics? 3. Give an expression for energy stored in a charged capacitor. 4. Draw a circuit diagram for internal resistance of a cell. 5. Give an expression for the thickness of a wire using air wedge. 6. What do you mean by colors of thin films? 7. What is time dilation? 8. State Heisenberg’s uncertainty principle. 9. Mention any two applications of a zener diode. 10. Draw the circuit diagram of a NOT gate using a transistor and give its truth table. SECTION – B (5X5=25) Answer ALL Questions 11. a) Determine the frequency of A.C mains using a sonometer. (or) b) Write down the laws transverse vibrations of a stretched string. 12. a) Derive an expression for the instantaneous current in a CR circuit.

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S3/UG2/6/A16

(or) b) Explain how you will compare two resistances using a potentiometer. 13. a) Light of wavelength 6000 Å falls normally on a thin wedge shaped film of refractive index 1.4, forming fringes that are 2 mm apart. Find the angle of the wedge. (or) b) In a Newton’s rings experiment the diameter of the 15th ring was found to be 0.590 cm and that of the 5th ring was 0.336 cm. If the radius of the plano-convex lens is 100 cm, calculate the wavelength of light used. 14. a) Derive Einstein’s mass-energy equation. (or) b) Write a note on length contraction 15. a) Explain the characteristics of a transistor in CE mode. (or) b) State and prove any one De Morgan’s theorem. SECTION - C (3X10=30) Answer any THREE Questions 16. Derive an expression for the velocity of a stretched string. 17. Determine the magnetic moment of a magnet using deflection and vibration magnetometer. 18. Give the theory of plane transmission grating. 19. Derive Schrodinger’s equation for a particle in a box. 20. Prove that NAND and gates are universal gates. ************

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ALLIED PHYSICS - 04 16.pdf

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