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Light Photons, Rays, and Waves

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Why? Files segment describing what light is.

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That's weird. When I look on top of the mural, I can't see anything. Then, when I look at 00:00:00
the filter, I can see everything. Why is that? 00:00:10
It's because of polarization. Welcome to the Boston Museum of Science. My name is Michael 00:00:13
Sheese, and I'm in charge of the museum's physical science program. 00:00:18
Hi, Mr. Sheese. I'm PJ. Well, you see, the Trios detective sent me an email, and they 00:00:20
said that coming here would be a great place to learn more about light. So here I am. 00:00:26
We've got a great exhibit on light and optics called Lighthouse. What exactly would you 00:00:30
like to know about light? Well, I think I should understand what exactly 00:00:34
is light. I've got a great place to start. Okay, great. 00:00:37
All light is energy. Do you know what the main source of energy is here on Earth? 00:00:45
The sun? That's exactly right. The sun is a natural 00:00:50
source of energy. Light can be either artificial or natural. What might be an example of an 00:00:53
artificial source? Would that be something like a light bulb? 00:00:58
That's right. In fact, I happen to have one right here. 00:01:02
Cool. Let's go. 00:01:04
Okay. Is light the same, whether it's artificial or natural? 00:01:06
All light is made up of photons. We learned about photons in our electricity 00:01:10
mystery. And did you learn about atoms, too? 00:01:15
Yes, we did. There are three different parts, protons, neutrons, and electrons. 00:01:17
That's right. The electrons that make up light are unstable, and from time to time, 00:01:21
they absorb energy. One of the ways the atom gets rid of this energy is it releases it in a bundle 00:01:25
of light called a photon. Are there different kinds of photons? 00:01:30
Yes. The amount of energy that's in the photon determines what kind of light wave is produced. 00:01:33
Wait a minute. Light is a wave? 00:01:40
That's right. In fact, I've got a demonstration of it right here. 00:01:42
I'm going to hold on to my end of the rope. I'd like you to take the other end of the rope. 00:01:46
And if you can wiggle it back and forth, we can demonstrate what a light wave might look like. 00:01:50
Light coming from the sun takes eight minutes to reach us, and that's 98 million miles away. 00:01:56
Whoa, that's fast. As you can see here, 00:02:01
light travels in a straight line called a ray. Yes, but then when I put the light on the prism, 00:02:04
the light bends. That's right. 00:02:09
Light won't travel in a straight line unless it hits something and becomes obstructed. 00:02:11
Oh, I think I understand. Why don't you take some time and explore 00:02:15
some of our other exhibits on light and optics? Thanks. I saw some great exhibits that I want 00:02:19
to go to. Great. 00:02:23
Bye. See ya. 00:02:24
Wow, this is so weird. I can't grab this ring. 00:02:26
This is just like what I saw on the Franz Harari's magic show. 00:02:30
Man. Am I seeing things? 00:02:33
And for my final light exhibit, I can create my own picture by waving the wand. 00:02:39
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Idioma/s:
en
Niveles educativos:
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Autor/es:
NASA LaRC Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
373
Fecha:
28 de mayo de 2007 - 15:32
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
02′ 45″
Relación de aspecto:
4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
Resolución:
480x360 píxeles
Tamaño:
16.50 MBytes

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