You can also do it on a paper and then make a photo (on your notebook).
Showing posts with label light. Show all posts
Showing posts with label light. Show all posts
Wednesday, 29 April 2020
Heat and light test
Answer this test, take a photo or scan if you can (on a printer) and then send it to me by Google Classroom. Write your name please.
You can also do it on a paper and then make a photo (on your notebook).
You can also do it on a paper and then make a photo (on your notebook).
Tuesday, 28 April 2020
Heat and light (answers)
Here are the answers to the exercise of heat and light. Here you can see the activity in case you want to check or you haven't done it.
The mindmap about the properties of light could be something like this:
Correct it and do the mindmap in your notebook.
Please leave your comments when you have finished.
Correct it and do the mindmap in your notebook.
Please leave your comments when you have finished.
Friday, 17 April 2020
Translucent Effect (Experiment)
Good morning! Here is a cool experiment. Materials you need:
Procedure
1. Cut a piece of thread and stick it to the paper. Hang the paper to the ceiling in front of a wall (if it's dark better) and leave it there 15 cm aprox from the paper to the wall.
2. Light the paper with the torch and observe how light can pass to the other side. Write this on your notebook. Can light pass to the other side and hit the wall?
3. Using the straw, put some oil on the paper. Be careful and don't drop it to the floor. Half of the paper should be covered with oil. The oil will be absorved and it will spread along the paper. In the end the lower half of the paper should have oil.
4. Light the paper over the oil part. Compare with the other part.
Write your conclusions about this. Why does this happen? Have you seen something not normal?
Enjoy! 😊😎
Explanation:
Only opaque objects, by blocking light rays, form shadows. Paper is not opaque. It is translucent. The paper blocks much of the light rays. The oil, by penetrating into the fibers of the paper, creates small transparent cracks that let light through. This is not the case with water, which cannot easily penetrate between the common paper fibers.
Watch the video:
- A sheet of white paper
- Oil
- A straw
- A torch or some source of light
- Thread
- Scissors
- Sellotape
- A dark room or place in the house
- A member of your family can help
- Notebook
Procedure
1. Cut a piece of thread and stick it to the paper. Hang the paper to the ceiling in front of a wall (if it's dark better) and leave it there 15 cm aprox from the paper to the wall.2. Light the paper with the torch and observe how light can pass to the other side. Write this on your notebook. Can light pass to the other side and hit the wall?
3. Using the straw, put some oil on the paper. Be careful and don't drop it to the floor. Half of the paper should be covered with oil. The oil will be absorved and it will spread along the paper. In the end the lower half of the paper should have oil.
4. Light the paper over the oil part. Compare with the other part.
Write your conclusions about this. Why does this happen? Have you seen something not normal?
Enjoy! 😊😎
Explanation:
Only opaque objects, by blocking light rays, form shadows. Paper is not opaque. It is translucent. The paper blocks much of the light rays. The oil, by penetrating into the fibers of the paper, creates small transparent cracks that let light through. This is not the case with water, which cannot easily penetrate between the common paper fibers.
Watch the video:
Thursday, 16 April 2020
Light (activity)
Read about light in this link.
Then carry on with these two worksheets:
Once you finish the first one go with this one. (Copy it in your notebook).
Enjoy! 😀😎
Then carry on with these two worksheets:
Once you finish the first one go with this one. (Copy it in your notebook).
Enjoy! 😀😎
Wednesday, 15 April 2020
Light
What Is Light?
Annie's family was having a bonfire last weekend. It was getting dark outside, so she stayed near the bonfire. But that made her curious: How do bonfires create light much like the Sun does? So, Annie asked her dad.
He explained that, like the bonfire, the sun burns gasses to emit (or give off) light. However, the sun burns different types of gasses, which explains why the sun gives off a different color of light than the bonfire.
While they use different types of gasses, there is one main reason that both emit light: the burning of gasses causes a chemical reaction that creates electromagnetic energy, which is a type of energy that takes the form of magnetic and electrical waves.
In physics, waves are the invisible vibrations that affect objects and even space to create light, color and more. The electromagnetic energy created from the burning gasses is what makes light.
But there's much more to be learned about light. In fact, light has different behaviours depending on the type of object that it hits. It can be reflected, refracted, absorbed or transmitted.
Light has three main properties: it is an electromagnetic wave, it travels in straight lines and it moves very fast. Light travels at the speed of light which is the fastest speed possible in the universe. That is 300.000 km per second!
Watch this video and write the most important ideas in your notebook.
Then make a comment telling me what aspect of light you like most and why.
Enjoy!
Annie's family was having a bonfire last weekend. It was getting dark outside, so she stayed near the bonfire. But that made her curious: How do bonfires create light much like the Sun does? So, Annie asked her dad.
He explained that, like the bonfire, the sun burns gasses to emit (or give off) light. However, the sun burns different types of gasses, which explains why the sun gives off a different color of light than the bonfire.
While they use different types of gasses, there is one main reason that both emit light: the burning of gasses causes a chemical reaction that creates electromagnetic energy, which is a type of energy that takes the form of magnetic and electrical waves.
In physics, waves are the invisible vibrations that affect objects and even space to create light, color and more. The electromagnetic energy created from the burning gasses is what makes light.
But there's much more to be learned about light. In fact, light has different behaviours depending on the type of object that it hits. It can be reflected, refracted, absorbed or transmitted.
Light has three main properties: it is an electromagnetic wave, it travels in straight lines and it moves very fast. Light travels at the speed of light which is the fastest speed possible in the universe. That is 300.000 km per second!
Watch this video and write the most important ideas in your notebook.
Then make a comment telling me what aspect of light you like most and why.
Enjoy!
Thursday, 26 March 2020
Light (Natural)
Light is a form of radiant energy that we can see with our eyes and is transferred through radiation. It’s made up of microscopic particles that travel in the form of electromagnetic waves. Without light, we wouldn’t be able to see.
The Sun is a natural source of light, but many artificial light sources have been invented too. For example, light bulbs and computer screens both produce light energy.
Light phenomena
Light phenomena are observable events that occur when light interacts with matter.
Light travels in straight lines. When we put an opaque object in front of light, we can see a shadow behind the object. Light is blocked by the object, and forms the shadow.
The shadow has the same shape as the object because the waves of light that aren’t blocked travel in straight lines.
Light travels very fast. It is the fastest thing in the universe. Nothing can travel faster than light. The speed of light is 300.000 kilometres per second.
Objects react to light in different ways.
This glass is transparent: it doesn’t block the light. Imagine a house with no windows. It would be dark.
The curtains are made of a translucent material: they block some light, but some light passes through the material.
Thick curtains or even a wall can be opaque: it blocks the light completely.
Uses of light energy
We use light energy in many ways.
• We use light from the Sun to see and to produce electrical energy with solar panels.
• We use light energy to see at night. Light energy enables us to see things on television and computer screens.
• Lights can indicate when a machine is switched on.
Reflection occurs when light energy bounces off a surface and changes direction. Reflection is one of the basic laws of light.
We know that light travels in straight lines. However, some surfaces, like mirrors, cause the light to change direction.
Smooth surfaces, such as glass, metal or the surface of a large body of water, reflect light better than rough surfaces, such as wood or stone. For example, when light energy hits a mirror, it’s reflected. As a result, we see a reflection in the mirror.
Light travels in a straight line from the object to the mirror.
The mirror reflects the light, causing it to change direction.
A boy or a girl can see the reflection of the object in the mirror When light passes from one medium to another, for example, from air to water, the light energy changes direction. This process is called refraction.
Water changes the direction of the light rays that pass through it.
When we look at the straw, it appears to be bent. This is because the water is refracting the light.
White light
White light is made up of all the colours combined together. We can separate white light into colours by refraction. The colours are not refracted equally, so we see all the different colours. For example, prisms reffract light. As a result, we see the colours that make up white light.
Activities
1. Match to make sentences in your notebook:
a) Reflection causes light to...
b) Refraction causes light to...
c) White light is made up of...
1. ... bend as it passes through a different medium.
2. ... all the colours combined together.
3. ... change direction when it hits a surface.
2. With someone from your family, predict which of these materials will be opaque, transparent and translucent.
Aluminium foil, cardboard, a sheet of paper, cling film, a plastic water bottle, a white T-shirt
Use a torch to test your predictions. How many of your predictions were correct?
Make a table to show your predictions and your results.
3. Write down three important features of light.
4. Once you finish complete the assignment on milton.
Enjoy! 😎
The Sun is a natural source of light, but many artificial light sources have been invented too. For example, light bulbs and computer screens both produce light energy.
Light phenomena
Light phenomena are observable events that occur when light interacts with matter.
Light travels in straight lines. When we put an opaque object in front of light, we can see a shadow behind the object. Light is blocked by the object, and forms the shadow.
Light travels very fast. It is the fastest thing in the universe. Nothing can travel faster than light. The speed of light is 300.000 kilometres per second.
Objects react to light in different ways.
 |
| A transparent window. It doesn't block the light |
 |
| Curtains like this are translucent |
The curtains are made of a translucent material: they block some light, but some light passes through the material.
Thick curtains or even a wall can be opaque: it blocks the light completely.
Uses of light energy
We use light energy in many ways.
• We use light from the Sun to see and to produce electrical energy with solar panels.
• We use light energy to see at night. Light energy enables us to see things on television and computer screens.
• Lights can indicate when a machine is switched on.
 |
| Solar panels |
Reflection occurs when light energy bounces off a surface and changes direction. Reflection is one of the basic laws of light.
We know that light travels in straight lines. However, some surfaces, like mirrors, cause the light to change direction.
Smooth surfaces, such as glass, metal or the surface of a large body of water, reflect light better than rough surfaces, such as wood or stone. For example, when light energy hits a mirror, it’s reflected. As a result, we see a reflection in the mirror.
Light travels in a straight line from the object to the mirror.
The mirror reflects the light, causing it to change direction.
A boy or a girl can see the reflection of the object in the mirror When light passes from one medium to another, for example, from air to water, the light energy changes direction. This process is called refraction.
Water changes the direction of the light rays that pass through it.
When we look at the straw, it appears to be bent. This is because the water is refracting the light.
White light
White light is made up of all the colours combined together. We can separate white light into colours by refraction. The colours are not refracted equally, so we see all the different colours. For example, prisms reffract light. As a result, we see the colours that make up white light.
Activities
1. Match to make sentences in your notebook:
a) Reflection causes light to...
b) Refraction causes light to...
c) White light is made up of...
1. ... bend as it passes through a different medium.
2. ... all the colours combined together.
3. ... change direction when it hits a surface.
2. With someone from your family, predict which of these materials will be opaque, transparent and translucent.
Aluminium foil, cardboard, a sheet of paper, cling film, a plastic water bottle, a white T-shirt
Use a torch to test your predictions. How many of your predictions were correct?
Make a table to show your predictions and your results.
3. Write down three important features of light.
4. Once you finish complete the assignment on milton.
Enjoy! 😎
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