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Sound Waves and Frequency

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Why? Files segment explaining what sound is.

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This place is really neat. Yeah, but I think we need to find Miss Leslie Bowie. 00:00:00
Hi, I'm Leslie Bowie. I'm curator here at the Children's Museum of Virginia. How can I help you? 00:00:07
Hi. Some of our dogs are barking and are waking us up at night. 00:00:12
And we think that a really strange sound may be making them bark. 00:00:17
Can you tell us what sound is? 00:00:21
I think I can help you understand. Come over this way. 00:00:23
Sound is created by vibration. A vibration is a back and forth motion, a lot like this slinky. 00:00:26
An object vibrates and pushes air molecules around. Then these set other air molecules into motion. 00:00:36
But we can't actually see the sound waves. 00:00:44
But I can help you see the vibrations. This is a tuning fork. Listen. 00:00:47
I can hear a sound. Me too. 00:00:53
And I can help you see the vibrations. 00:00:57
What is frequency? 00:01:11
Frequency is the rate of vibration. The higher the frequency, the higher the pitch. 00:01:13
Here, let me show you. I've flattened a straw and cut points. Now blow hard. 00:01:18
I'll cut the straw. 00:01:28
What do you notice? 00:01:34
It's higher. 00:01:35
I'll cut it again. What changes? 00:01:37
It's even higher. 00:01:42
It's kind of like these tubes. The longer the tube, the lower the sound. 00:01:44
That's right. The shorter the tube, the higher the sound. It's a lot like this straw. 00:01:52
Bianca, can you hear me? 00:01:58
Yes, Kaylee. We're having so much fun. But now it's time to go. 00:02:01
I don't want to go, but I'll go tell Mrs. Mooey thanks for the information. 00:02:06
Okay. See you. Bye. 00:02:11
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Idioma/s:
en
Niveles educativos:
▼ Mostrar / ocultar niveles
      • Nivel Intermedio
Autor/es:
Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
538
Fecha:
28 de mayo de 2007 - 15:32
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
02′ 16″
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:
13.74 MBytes

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