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Light

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Subido el 3 de mayo de 2020 por Luis Miguel I.

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Good morning! Ready to start the week? Well, we got natural science, last week we were talking about sound, and this week we talk about light. Pay attention! 00:00:00
Light sources produce light energy, and without light energy we wouldn't be able to see anything. 00:00:11
We got two main types that are artificial and natural. Artificial light sources are man-made, like us, and natural light sources are found in nature. 00:00:17
examples of natural light sources the most important the Sun other examples 00:00:26
are linings during a storm or some animals like fireflies all right 00:00:32
artificial light sources examples a candle fireworks you like them okay the 00:00:37
characteristics of lights the first one speeds light travels very fast about 00:00:46
300,000 kilometers per second. This is called the speed of light and is faster than sound. 00:00:52
important light travels in straight lines called rays. Straight lines, not the 00:00:58
curved waves we see with sound. It's different. really appears white to us, but it's 00:01:06
really made up of all the different colors. And we got three possibilities when a light 00:01:13
becomes in contact with an object. It can be absorbed, it can be reflected, or can 00:01:19
be refracted. Materials can be transparent when all light passes 00:01:25
through, they can be translucent when some light passes through, and opaque 00:01:32
when no light passes through. The second possibility we were talking about was 00:01:38
that light is reflected, so we talk about reflection. It occurs when rays of light 00:01:45
are not absorbed by an object and bounce off instead we have smooth surface light 00:01:50
reflect in the same direction however on rough surface light reflects in all 00:01:58
directions the most famous example of reflection are the mirrors okay now 00:02:03
third possibility we're talking that light refracts the process called 00:02:11
refraction it occurs when light travels in a straight line but it passes through 00:02:15
a medium with a different density it changes direction example look at this 00:02:21
pencil water has got a different density so that's why we see that light changes 00:02:25
the direction famous examples lenses and of course the rainbow these are examples 00:02:31
of refraction well this is the lights if something is not clear please ask your 00:02:38
teacher and well I'll see you soon goodbye 00:02:45
Autor/es:
Luis Miguel Isidro Navarro
Subido por:
Luis Miguel I.
Licencia:
Reconocimiento - No comercial - Compartir igual
Visualizaciones:
73
Fecha:
3 de mayo de 2020 - 10:42
Visibilidad:
Público
Duración:
02′ 49″
Relación de aspecto:
1.78:1
Resolución:
1920x1080 píxeles
Tamaño:
77.98 MBytes

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