Difference between revisions of "Light"
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*[[Transmit|Transmitted]] - [[Light]] can pass through a [[medium]]. | *[[Transmit|Transmitted]] - [[Light]] can pass through a [[medium]]. | ||
*[[Absorb (physics)|Absorbed]] - The [[energy]] [[Energy Transfer|transferred]] by [[light]] can be taken in by an [[opaque]] [[material]]. | *[[Absorb (physics)|Absorbed]] - The [[energy]] [[Energy Transfer|transferred]] by [[light]] can be taken in by an [[opaque]] [[material]]. | ||
| − | *[[Reflection|Reflected]] - [[Light]] can bounce | + | *[[Reflection|Reflected]] - [[Light]] can bounce off a surface. This can be either [[Diffuse Reflection]] or [[Specular Reflection]]. |
*[[Refraction|Refracted]] - [[Light]] can change direction when it changes [[medium]]. | *[[Refraction|Refracted]] - [[Light]] can change direction when it changes [[medium]]. | ||
===Medium=== | ===Medium=== | ||
| − | : [[Light]] can travel through a [[transparent]] [[medium]] but it does not need | + | : [[Light]] can travel through a [[transparent]] [[medium]] but it does not need [[matter]] to travel through as it can pass through a [[vacuum]]. |
: [[Light]] can travel through any [[transparent]] [[solid]], [[liquid]], [[gas]]. | : [[Light]] can travel through any [[transparent]] [[solid]], [[liquid]], [[gas]]. | ||
: [[Light]] travels most quickly through a [[vacuum]]. | : [[Light]] travels most quickly through a [[vacuum]]. | ||
| Line 44: | Line 44: | ||
*Indigo | *Indigo | ||
*Violet | *Violet | ||
| + | |||
| + | ==Key Stage 4== | ||
| + | ===Meaning=== | ||
| + | '''Visible light''' is an [[Electromagnetic Wave|electromagnetic wave]] that [[human]]s can see. | ||
| + | |||
| + | ===About Light=== | ||
| + | ====Properties==== | ||
| + | : '''Visible light''' is a [[Transverse Wave|transverse wave]]. | ||
| + | : '''Visible light''' can travel through a [[vacuum]] as well as through any [[transparent]] [[solid]], [[liquid]], [[gas]]. | ||
| + | : The [[speed]] of '''visible light''' through a [[vacuum]] is 300,000,000[[m/s]]. | ||
| + | As a [[wave]] [[light]] can be: | ||
| + | *[[Transmit|Transmitted]] - '''Visible light''' can pass through a [[medium]]. | ||
| + | *[[Absorb (physics)|Absorbed]] - The [[energy]] [[Energy Transfer|transferred]] by '''visible light''' can be taken in by an [[opaque]] [[material]]. | ||
| + | *[[Reflection|Reflected]] - '''Visible light''' can bounce off the [[interface]] between two [[medium|media]]. This can be either [[Diffuse Reflection]] or [[Specular Reflection]]. | ||
| + | *[[Refraction|Refracted]] - '''Visible light''' can change direction when it crosses the [[interface]] between two [[medium|media]]. | ||
| + | =====Colour===== | ||
| + | : Different [[frequency|frequencies]] of '''visible light''' are [[reflect]]ed or [[Absorb (Physics)|absorbed]] by different surfaces giving them colour. | ||
| + | '''Visible light''' can be divided into 7 [[colour]]s: | ||
| + | *Red - The lowest [[frequency]] and longest [[wavelength]] of '''visible light'''. | ||
| + | *Orange | ||
| + | *Yellow | ||
| + | *Green | ||
| + | *Blue | ||
| + | *Indigo | ||
| + | *Violet - The highest [[frequency]] and shortest [[wavelength]] of '''visible light'''. | ||
| + | |||
| + | ====Applications==== | ||
| + | : '''Visible light''' is used for [[sight]], photography, microscopy, telescopy because it can be seen with the [[human]] [[eye]]. | ||
| + | ====Dangers==== | ||
| + | : There are no dangers of '''visible light''', unless it is extremely intense in which case it could cause blindness. | ||
Revision as of 22:24, 20 February 2019
Contents
Key Stage 2
Meaning
Light is what we can see with our eyes and dark is when there is not enough light to see things clearly.
About Light and Dark
- Light can be very bright or it can be very dark.
- When light is very bright it can hurt our eyes. Light from The Sun is very bright and we shouldn't look at The Sun because it can cause people to go blind.
- When there is not enough light to see we say it is dark. At night time it is very dark which is why it is hard to see.
 |
 |
| No-one can see because there is no light so the room is dark. | The man can see the light bulb because light from the bulb goes into the man's eyes. The boy cannot see the light bulb because his eyes are closed. |
Key Stage 3
Meaning
Light is a wave that transfers energy and information.
About Light
- Light is a transverse wave.
- Light can travel through a vacuum as well as through any transparent solid, liquid, gas.
- The speed of light through a vacuum is 300,000,000m/s.
- Transmitted - Light can pass through a medium.
- Absorbed - The energy transferred by light can be taken in by an opaque material.
- Reflected - Light can bounce off a surface. This can be either Diffuse Reflection or Specular Reflection.
- Refracted - Light can change direction when it changes medium.
Medium
- Light can travel through a transparent medium but it does not need matter to travel through as it can pass through a vacuum.
- Light can travel through any transparent solid, liquid, gas.
- Light travels most quickly through a vacuum.
- Light travels most slowly through solids.
Colour
Light can be divided into 7 colours:
- Red
- Orange
- Yellow
- Green
- Blue
- Indigo
- Violet
Key Stage 4
Meaning
Visible light is an electromagnetic wave that humans can see.
About Light
Properties
- Visible light is a transverse wave.
- Visible light can travel through a vacuum as well as through any transparent solid, liquid, gas.
- The speed of visible light through a vacuum is 300,000,000m/s.
- Transmitted - Visible light can pass through a medium.
- Absorbed - The energy transferred by visible light can be taken in by an opaque material.
- Reflected - Visible light can bounce off the interface between two media. This can be either Diffuse Reflection or Specular Reflection.
- Refracted - Visible light can change direction when it crosses the interface between two media.
Colour
- Different frequencies of visible light are reflected or absorbed by different surfaces giving them colour.
Visible light can be divided into 7 colours:
- Red - The lowest frequency and longest wavelength of visible light.
- Orange
- Yellow
- Green
- Blue
- Indigo
- Violet - The highest frequency and shortest wavelength of visible light.
Applications
- Visible light is used for sight, photography, microscopy, telescopy because it can be seen with the human eye.
Dangers
- There are no dangers of visible light, unless it is extremely intense in which case it could cause blindness.