WavesWaves

http://www.youtube.com/watch?v=Xy_9bx6U8_0&feature=relmfu

http://www.youtube.com/watch?v=Xy_9bx6U8_0&feature=relmfu

11

Objectives

To develop understanding of children difficulties associated with waves

To use a range of resources available for the teaching of waves

To discuss some teaching strategies within the topic

Waves in the news

http://www.bbc.co.uk/news/world-asia-pacific-14967535

http://www.bbc.co.uk/news/science-environment-15017484

http://www.bbc.co.uk/nature/15274875

National Curriculum KS3

2006 Waves at Key Stage 4

Energy, electricity and radiations 7) In their study of science, the following should be

covered:

a. Energy transfers can be measured and their efficiency calculated, which is important in considering the economic costs and environmental effects of energy use

b. Electrical power is readily transferred and controlled, and can be used in a range of different situations

c. Radiations, including ionising radiations, can transfer energy

d. Radiations in the form of waves can be used for communication.

Specifications

Look at the waves content of the Physics GCSE specifications provided, OCR and AQA

What are the similarities between them? What are the differences? Does this matter?

A pupil is in a dark room and cannot see anything. When the light is turned on in the room she sees a book on the table. How is she able to see the book?

Children’s ideas about vision

Seeing…

Theories

1. Light rays travel from our eyes to the objects to enable us to see them

2. Light rays are produced by a source, reflect off objects and go into our eyes so we can see them

A. Light travels in straight linesB. We can see at night when

there is no sunC. Sunglasses are worn to

protect our eyesD. If there is no light we can’t

see a thingE. We ‘stare at people’, ‘ look

daggers’, and ‘catch other people’s eye’

F. You have to look at something to see it

Laser demo

KS4 Waves question pairs

Find your partner

A selection of practical activities or demonstrations from KS3/4/5

Slinky springRipple tankRayboxs; reflection, refraction, TIR, spectrum, colour filters

Oscilloscope, signal generator, microphone, loudspeaker

Pinhole camerasUVHearing with 4 phones

Questioning activity

What’s the difference between reflection and refraction?

What’s the difference between interference and diffraction?

What’s the difference between a light wave and a sound wave?

What’s the difference between a compression wave and transverse wave?

Multimedia tools

Audacity: http://audacity.sourceforge.net

Multimedia Science School

Multimedia WavesMultimedia SoundCrocodile Physics/Yenka

Applets: http://www.cbu.edu/~jvarrian/applets/waves1/lontra_g.htm

http://www.phys.hawaii.edu/~teb/java/ntnujava/emWave/emWave.html

http://micro.magnet.fsu.edu/primer/java/interference/doubleslit/index.html

Youtube videos:http://www.youtube.com/watch?v=v9Wdf-RwLcs

http://www.youtube.com/watch?gl=GB&hl=en-GB&v=ofESdVdX-fY

Tony’s demos

1.Melde’s experiment

2.Diffraction grating

Microwave oven

Hot spot about 6cm apart

c=f

(= 0.06 2)

=2450106 0.12

=294106

=2.9108ms-1