SECTION B ESSAY 1 hours [ 60 marks ] Answer eight questions in all. Five questions from Part I and three questions from Part II. PART I [15 marks] Answer any five questions from this part. All questions carry equal marks. 1. (a) Define strain. (b) A rubber band is stretched to twice its original length. Calculate the strain on the rubber band. 2. State three materials used for making optical fibres. 3. Name three classes of magnetic materials. 4. (a) What is an intrinsic semiconductor? (b) Distinguish between the p-type and n-type semiconductors. 5. 6. A black body radiates maximum energy when its surface temperature T and the corresponding wavelength max are related by the equation, max T = constant. -3 0 Given the values of the constant and surface temperature as 2.9 x 10 mK and 57 C respectively, Calculate the frequency of the energy radiated. 7. (a) What does the acronym LASER stand for? (b) What is a laser? (PART II) [45 marks] Answer any three questions from this part. All questions carry equal marks. 8 (a) Define uniform acceleration, (b) Forces act on a car in motion, list the: (i) horizontal forces and their directions; (ii) vertical forces and their directions, -1 (c) A car starts from rest and accelerate uniformly for 20s to attain a speed of 25 ms . It maintains this speed for 30s before decelerating uniformly to rest. The total time for the journey is 60 s. (i) Sketch a velocity-time graph for the motion, (ii) Use the graph to determine the: Want more Physics WASSCE Theory Exam Questions () total distance travelled by the car; Get the complete WAEC Physics Exam Past Questions () deceleration of the car. Paper Objective & Essay in PDF or Ms-Word from us. Continue reading to know how…..