Core Physics – Energy L/O :- To know the properties of waves and be able to explain reflection “Mirror, Mirror on the wall” Exam Date -

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Presentation transcript:

Core Physics – Energy L/O :- To know the properties of waves and be able to explain reflection “Mirror, Mirror on the wall” Exam Date -

Quick Quiz - What do you remember from last lesson? Draw and label a wave What is the use of a step-up transformers What is the equation for working out the speed of a wave? How does a coal power station turn the turbine to spin the generator? What is the equations for working out efficiency? What are the 2 different types of wave? Give an example How do you work out the pay-back time for insulation? What are the pros and cons of wind energy? Where are step-up transformers used? How does increasing the volume of a sound affect the wave?

2 Sec A B C 1.Which wave has is the quietist? Why? 2.Which wave has the highest pitch? Why? 3.Which wave is the loudest? Why? 4.What is the frequency of wave C? Why?

All waves can do 3 things Reflect Refract Diffract

Do you notice anything strange about this picture? Can you explain why this is?

What do you know about reflection?

End TASK There are a number of objects around the room. You are going to be asked a)What do you notice? b)How does it work? c)What does it tell you about reflection? You will need to fill out a sheet in pairs. You should take it in turns to fill out the sections. You will then be asked to feed your ideas back to other groups

2 Minute Timer 2:001:591:581:571:561:551:541:531:521:511:501:491:481:471:461:451:441:431:421:411:401:391:381:371:361:351:341:331:321:311:301:291:281:271:261:251:241:231:221:211:201:191:181:171:161:151:141:131:121:111:101:091:081:071:061:051:041:031:021:011:000:590:580:570:560:550:540:530:520:510:500:490:480:470:460:450:440:430:420:410:400:390:380:370:360:350:340:330:320:310:300:290:280:270:260:250:240:230:220:210:200:190:180:170:160:150:140:130:120:110:100:090:080:070:060:050:040:030:020:01End

Solar Tubes What do you notice? How does it work? What does it tell you about reflection? Periscope What do you notice? How does it work? What does it tell you about reflection?

Glass and Candle What do you notice? How does it work? What does it tell you about reflection? Solar Kettle What do you notice? How does it work? What does it tell you about reflection?

Mirrors and spoons What do you notice? How does it work? What does it tell you about reflection? Da Vinci Writing What do you notice? How does it work? What does it tell you about reflection?

07/12/2015 Reflection Incident ray Normal Reflected ray Angle of incidence Angle of reflection Mirror Angle of incidence = Angle of reflection

07/12/2015 Using mirrors Two examples:

07/12/2015 Finding the Critical Angle… 1) Ray gets refracted 4) Ray gets internally reflected 3) Ray still gets refracted (just!) 2) Ray still gets refracted THE CRITICAL ANGLE

07/12/2015 Sound can also be reflected Bats use echoes to locate insects. They time how long the echo takes to come back and use that to locate the insect An Echo is a reflected sound wave Echolocation is also used in the shipping industry but remember Sound in air = 330m/s Sound in water = 1500m/s

What have you learnt? Do you know what 3 things all waves can do? Do you know what the law of reflection is? Do you know what the reflection of a sound wave is called?