Light Lesson 1
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Transcript of Light Lesson 1
![Page 1: Light Lesson 1](https://reader033.fdocuments.us/reader033/viewer/2022051611/54b84aa04a79599a308b4b54/html5/thumbnails/1.jpg)
LIGHT LIGHT –– Lesson 1 Lesson 1
Targets 1. To know that light is a form of
energy which travels away from a source in straight line
2. To learn that light travels at a very high speed
![Page 2: Light Lesson 1](https://reader033.fdocuments.us/reader033/viewer/2022051611/54b84aa04a79599a308b4b54/html5/thumbnails/2.jpg)
Making lightMaking light
Light needs an energy source to be created.
Once created it travels at high speed (3 000 000 metres per second) away from the source
![Page 3: Light Lesson 1](https://reader033.fdocuments.us/reader033/viewer/2022051611/54b84aa04a79599a308b4b54/html5/thumbnails/3.jpg)
Sources of lightSources of light
Natural sources Sun. Moon (reflected
sunlight). Burning wood. Lightning Stars
Artificial sources
Candles. Lamps. Flashlight
bulbs. TV. Projector
![Page 4: Light Lesson 1](https://reader033.fdocuments.us/reader033/viewer/2022051611/54b84aa04a79599a308b4b54/html5/thumbnails/4.jpg)
Light travels much faster than sound. For example:
1) Thunder and lightning start at the same time, but we will see the lightning first.
2) When a starting pistol is fired we see the smoke first and then hear the bang.
![Page 5: Light Lesson 1](https://reader033.fdocuments.us/reader033/viewer/2022051611/54b84aa04a79599a308b4b54/html5/thumbnails/5.jpg)
How fast does light really How fast does light really traveltravel Across a field in
less than one millionth of a second.
From the Moon in 1.3 seconds
From the Sun in 8 minutes
From the nearest star in 4 years
![Page 6: Light Lesson 1](https://reader033.fdocuments.us/reader033/viewer/2022051611/54b84aa04a79599a308b4b54/html5/thumbnails/6.jpg)
Light travels VERY FAST – around 300,000 kilometres per second.
At this speed it can go around the world 8 times in one second.
![Page 7: Light Lesson 1](https://reader033.fdocuments.us/reader033/viewer/2022051611/54b84aa04a79599a308b4b54/html5/thumbnails/7.jpg)
Light travels in straight
lines.
![Page 8: Light Lesson 1](https://reader033.fdocuments.us/reader033/viewer/2022051611/54b84aa04a79599a308b4b54/html5/thumbnails/8.jpg)
Light travels in straight Light travels in straight lineslines
Three screens experiment shows that this is true
![Page 9: Light Lesson 1](https://reader033.fdocuments.us/reader033/viewer/2022051611/54b84aa04a79599a308b4b54/html5/thumbnails/9.jpg)
Light travels in straight Light travels in straight lineslines
Three screens experiment shows that this is true
![Page 10: Light Lesson 1](https://reader033.fdocuments.us/reader033/viewer/2022051611/54b84aa04a79599a308b4b54/html5/thumbnails/10.jpg)
Amazing factAmazing fact
To see light you have to destroy it, once it enters your eye it does not come out but is absorbed by the cells on the retina!
![Page 11: Light Lesson 1](https://reader033.fdocuments.us/reader033/viewer/2022051611/54b84aa04a79599a308b4b54/html5/thumbnails/11.jpg)
ShadowsShadows
Copy the diagram and draw lines to show how a shadow is formed