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How the Ear Works

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Subido el 28 de mayo de 2007 por EducaMadrid

582 visualizaciones

NASA Why? Files segment explaining how we hear sounds.

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We're known as the Treehouse Detectives. 00:00:00
We're trying to get some sleep, but the neighborhood dogs are keeping us up. 00:00:02
We want to know how our ears work. 00:00:05
That way we can figure out why the dogs keep barking. 00:00:07
And how sound travels. 00:00:10
If we know how sound travels, that might help us solve the problem. 00:00:11
I think I can help you out. Let's move into the other room. 00:00:14
What is all this stuff? 00:00:18
This is equipment we use to test people's hearing. 00:00:20
Could you tell us how our ears work? 00:00:22
Sure. The outer ear collects and concentrates the sound energy. 00:00:24
Then this is channeled down the ear canal, and the eardrum vibrates, and so do the small bones within the ear. 00:00:27
Then the sounds go through the cochlea, the hair cells bend, 00:00:33
and then the impulses are sent up the auditory nerve into the brain, where they're decoded. 00:00:36
Other sounds people can't hear? 00:00:41
Sure, if they're above a certain frequency. 00:00:43
The human ear can hear frequencies between 20 and 20,000 vibrations a second. 00:00:45
Frequencies. Hmm. That might be a clue. 00:00:50
Thanks for all your help. 00:00:53
Sure. Bye. 00:00:54
Bye, and good luck! 00:00:55
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Idioma/s:
en
Niveles educativos:
▼ Mostrar / ocultar niveles
      • Nivel Intermedio
Autor/es:
NASA LaRC Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
582
Fecha:
28 de mayo de 2007 - 15:32
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
00′ 57″
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:
5.84 MBytes

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