Light

WALT: the main properties of light 16/11/2018 WALT: the main properties of light

16/11/2018 Sources of light Objects that create light are “sources” of light or “luminous sources”. Name 2 luminous sources We can see non-luminous objects because light bounces off them and enters our eyes. Name 2 non-luminous sources

16/11/2018 How does light travel?

Light travels in straight lines: 16/11/2018 Properties of Light Light travels in straight lines: Laser

Light travels VERY FAST – around 300,000 kilometres per second. 16/11/2018 Light travels VERY FAST – around 300,000 kilometres per second. This would be the same speed as a plane going around the world 8 times in one second.

Light travels much faster than sound. For example: 16/11/2018 Light travels much faster than sound. For example: 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.

We see things because they reflect light into our eyes: 16/11/2018 We see things because they reflect light into our eyes: Homework

Shadows Shadows are places where light is “blocked”: Rays of light 16/11/2018 Shadows Shadows are places where light is “blocked”: Rays of light

Properties of Light summary 16/11/2018 Properties of Light summary Light travels in ________ ______. Light travels much _______ than sound. We see things because they ______ light into our eyes. ________ are formed when light is blocked by an object. Shadows faster straight lines reflect

Comparing speeds Speed km/sec Light Sound A car on a motorway 16/11/2018 Comparing speeds Speed km/sec Light Sound A car on a motorway A person walking