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Light and Sound ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Part 1 – Properties of Light ,[object Object],Laser
[object Object],At this speed it can go around the world 8 times in one second.
[object Object],[object Object],2)  When a starting pistol is fired we see the smoke first and then hear the bang.
[object Object],Homework
[object Object],A  luminous  object is one that produces light. A  non-luminous  object is one that reflects light. Luminous objects Reflectors
[object Object],Shadows are places where light is “blocked”: Rays of light
Properties of Light summary ,[object Object],[object Object],[object Object],[object Object]
Part 2 - Reflection ,[object Object],Incident ray Normal Reflected ray Angle of incidence Angle of reflection Mirror
[object Object],Angle of incidence = Angle of reflection In other words, light gets reflected from a surface at ____ _____ angle it hits it. The same !!!
Clear vs. Diffuse Reflection ,[object Object],Rough, dull surfaces have a  diffuse  reflection. Diffuse reflection  is when light is scattered in different directions
Using mirrors ,[object Object],1) A periscope 2) A car headlight
Colour ,[object Object],We can demonstrate this by splitting white light with a prism: This is how rainbows are formed: sunlight is “split up” by raindrops.
The colours of the rainbow: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Adding colours ,[object Object],[object Object],Adding blue and red makes magenta (purple) Adding blue and green makes cyan (light blue) Adding all three makes white again Adding red and green makes yellow
Seeing colour ,[object Object],For example, a red book only reflects red light: White light Only red light is reflected Homework
A white hat would reflect all seven colours: A pair of purple trousers would reflect purple light  (and red and blue, as purple is made up of red and blue): Purple light White light
Using coloured light ,[object Object],White light Shorts look blue Shirt looks red
[object Object],Red light Shirt looks red Shorts look black Blue light Shirt looks black Shorts look blue
Some further examples: Red Blue Red Blue Black Red Blue Red Red Black Blue Green Magenta book Green Green camel Green Blue teddy Black Green Red socks Colour object seems to be Colour of light Object Homework
Using filters ,[object Object],Red Filter Magenta Filter
Investigating filters Yellow Magenta Cyan Blue Green Red Colours that could be “seen” Colour of filter
Red Magenta White Yellow Blue Green Cyan
Refraction Refraction is when waves ____ __ or slow down due to travelling in a different _________.  A medium is something that waves will travel through.  When a pen is placed in water it looks like this: In this case the light rays are slowed down by the water and are _____, causing the pen to look odd.  The two mediums in this example are ______ and _______. Words – speed up, water, air, bent
 
 
Sound – The basics We hear things when they  vibrate .  If something vibrates with a  high frequency  (vibrates very ______) we say it has a  _____  pitch. If something vibrates with a  low frequency  (vibrates ______) we say it has a  ____  pitch. The lowest frequency I could hear was… Words – slowly, low, high, quickly
Drawing sounds… This sound wave has a  _____ frequency : This sound wave has a  ___ _frequency :
Drawing sounds… This sound wave has a  _____ amplitude  (loud): This sound wave has a  _____ amplitude  (quiet):
Hearing problems ,[object Object],[object Object],[object Object],[object Object],[object Object]
Other sound effects… ,[object Object],[object Object],[object Object]
The Ear Label your diagram with the following: These bones are vibrated by the eardrum  This tube carries the sound towards the eardrum This part is used to help us keep our balance This part “picks up” the vibrations This part of the ear contains many small hairs with turn vibrations into an electrical signal This part connects the ear to the mouth This part “channels” the sound towards the ear drum
The Ear

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Light presentation

  • 1.  
  • 2.
  • 3.
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.
  • 9.
  • 10.
  • 11.
  • 12.
  • 13.
  • 14.
  • 15.
  • 16.
  • 17.
  • 18. A white hat would reflect all seven colours: A pair of purple trousers would reflect purple light (and red and blue, as purple is made up of red and blue): Purple light White light
  • 19.
  • 20.
  • 21. Some further examples: Red Blue Red Blue Black Red Blue Red Red Black Blue Green Magenta book Green Green camel Green Blue teddy Black Green Red socks Colour object seems to be Colour of light Object Homework
  • 22.
  • 23. Investigating filters Yellow Magenta Cyan Blue Green Red Colours that could be “seen” Colour of filter
  • 24. Red Magenta White Yellow Blue Green Cyan
  • 25. Refraction Refraction is when waves ____ __ or slow down due to travelling in a different _________. A medium is something that waves will travel through. When a pen is placed in water it looks like this: In this case the light rays are slowed down by the water and are _____, causing the pen to look odd. The two mediums in this example are ______ and _______. Words – speed up, water, air, bent
  • 26.  
  • 27.  
  • 28. Sound – The basics We hear things when they vibrate . If something vibrates with a high frequency (vibrates very ______) we say it has a _____ pitch. If something vibrates with a low frequency (vibrates ______) we say it has a ____ pitch. The lowest frequency I could hear was… Words – slowly, low, high, quickly
  • 29. Drawing sounds… This sound wave has a _____ frequency : This sound wave has a ___ _frequency :
  • 30. Drawing sounds… This sound wave has a _____ amplitude (loud): This sound wave has a _____ amplitude (quiet):
  • 31.
  • 32.
  • 33. The Ear Label your diagram with the following: These bones are vibrated by the eardrum This tube carries the sound towards the eardrum This part is used to help us keep our balance This part “picks up” the vibrations This part of the ear contains many small hairs with turn vibrations into an electrical signal This part connects the ear to the mouth This part “channels” the sound towards the ear drum