QUESTION PAPERS (26/7/09)

IIPUC PHYSICS MARKS50
SECTIONA 1X10=10
1. WHAT IS PHOTO ELECTRIC EMISSION ?
2. WHAT ARE FRAUN HOFFER LINES ?
3. HOW ARE X RAYS ARE PRODUCED ?
4. Give the relation between threshold frequency and threshold wavelength ?
5. Will every photon in the incident beam emit a photoelectron ?
6. Write debrogile equation
7. What were the demerits of Rutherford atom model?
8. What is blue colour of sky due to?
9. What is stimulated emission ?
10. What is fluorescence ?
SECTION B 2X5=10
11. STATE AND EXPLAIN RAYLEIGHS LAW OF SCATTERING OF LIGHT ?
12. GIVE MERITS AND DEMERITS OF THOMSON MODEL ?
13. WHAT IS THE EFFECT OF INTENSITY OF LIGHT ON PHOTO CURRENT IN THE STUDY OF PHOTO ELECTRIC EFFECT ?
14. WHAT IS THERMIONIC EMISSION &SECONDARY EMISSION ?
15. WHAT IS GREEN HOUSE EFFECT ?
( ANY 6) SECTION C 5X6=30
1. DESCRIBE WITH A NEAT DIAGRAM THE DUNNINGTONS METHOD OF DETERMINING THE SPECIFIC CHARGE OF AN ELECTRON ?
2. Assuming the expression for radiusderive an expression for energy ?
3. Explain ruby laser with working ?
4. What are electro magnetic waves ? give their important characterists ?
5. DEFINE THE FOLLOWING i) PHOTO EMMISIVE CELL ii) PHOTO VOLTAIC CELL iii) PHOTO CONDUCTIVE CELL ?
6. DESCRIBE WITH A NEAT DIAGRAM &NECESSORY THEORY THOMSON EXPERIMENT TO VERIFY THE CONCEPT OF MATTER WAVES ?
7. BASED ON BOHRS POSTULATES OBTAIN AN EXPRESSION FOR THE RADIUS OF THE ELECTRON IN THE nTH orbit ?