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Heat and Light (III)
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Hello everyone, this is Kori, and today we are going to continue talking about heat and light.
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We will be focusing on light.
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Light is a form of energy emitted by luminous objects.
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Luminous objects are things like the sun or a light bulb.
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These objects emit or give off light energy.
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Light makes plants grow.
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At the beginning of the year, when you learned about cells, you learned that plant cells need light.
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Light allows them to grow.
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Light can be converted into electrical energy.
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Remember, energy can change form, so light energy can change to electrical energy.
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We can sense light using our sense of sight. We use our sense of sight when we use our eyes
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to see. Light enables us to see objects and distinguish shapes, sizes, and colors. If
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you are in a dark room and there is no light, you can't see objects. You don't know the
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shape, size, or color of the objects in the room. If you turn on the light in a room,
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you can see the objects. When there is light in a room, you can see the shape of objects.
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Is it a square, circle, rectangle? You can see the size. Is it big or small? The table
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is bigger than the chair. The lamp is smaller than the sofa. When there's light, you can
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also see the color. Is it red, green, or blue? Light travels in straight lines from its source.
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You can see this in our picture on the bottom right of the slide. Our source of light is the sun.
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Light from the sun travels through the window to the person's eye. The light moves in a direct
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way. It goes in a straight line. Now let's look at our concept map that shows sources of light.
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Light sources can be natural or artificial. Natural sources come from nature. The Sun is
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a natural source of light. Some living things are also natural sources of light. There are
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some types of bacteria, bugs, and fish that emit light. Artificial sources of light do not come
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directly from nature. They are man-made. Artificial sources of light require electricity.
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Light bulbs are an artificial source of light.
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Materials can be transparent, translucent, or opaque.
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Transparent materials allow light to pass through.
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Objects can be seen clearly.
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In this image, you can easily see through the transparent material.
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Translucent materials allow light to pass through, but objects cannot be seen clearly.
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In this image, you can see through the material because light is passing through, but you
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cannot see clearly.
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The object looks blurry.
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Opaque materials do not let any light pass through them.
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You can't see objects that are behind an opaque material.
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In this image, you can't see behind the opaque material.
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Let's review those types of materials again.
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Transparent materials allow all light to pass through.
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You can easily and clearly see through it.
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Glasses and windows are transparent materials.
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Can you think of more examples of transparent materials?
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Translucent materials allow some light to pass through.
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You can see light through the object,
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but the object is not clear.
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Stained glass and sunglasses
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are examples of translucent materials.
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Can you think of more examples of translucent materials?
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Opaque materials do not allow light to pass through.
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through. You can't see an object that is behind an opaque material.
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Wood is an opaque material. If you are standing behind a wooden door, you cannot be seen.
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Can you think of more examples of opaque materials? All right, that's all for now.
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Thanks for listening.
00:08:19
- Autor/es:
- IDOYA PÉREZ MARTÍN
- Subido por:
- Cp castilla alcobendas
- Licencia:
- Reconocimiento - No comercial - Compartir igual
- Visualizaciones:
- 35
- Fecha:
- 19 de abril de 2020 - 17:45
- Visibilidad:
- Público
- Centro:
- CP INF-PRI CASTILLA
- Duración:
- 08′ 24″
- Relación de aspecto:
- 1.56:1
- Resolución:
- 1184x760 píxeles
- Tamaño:
- 278.22 MBytes
