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High Frequency Noises

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Why? Files segment explaining how bats use high-frequency sound to navigate.

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You do look like you're looking for something. 00:00:00
My name is Mrs. Chris Lewis. Can I help you? 00:00:03
Hi, I'm Matthew, and this is Catherine, and we're working on a problem. 00:00:05
It's a sound problem, and we really need to learn more about how high frequency travels. 00:00:08
I may be able to help you. Let me show you something that uses high frequency sound. 00:00:13
Let me introduce you to a big brown bat. 00:00:18
Wow! Does he bite? 00:00:21
No, you can touch him gently if you'd like. 00:00:23
Do bats use high frequency sounds? 00:00:26
Sure. Bats hunt in the dark. 00:00:28
They use high frequency sounds and listen for the echoes in order to navigate and find food. 00:00:30
That's great. We heard that high frequency sounds don't travel very far. 00:00:35
Is that true for bats? 00:00:39
Yes, that's true. Air absorbs sound, especially high frequency sound. 00:00:41
Some bats can hear things 60 feet away, but the average is only about 15 feet away. 00:00:45
In school, we just did an experiment on how fast sound travels. 00:00:51
This sounds amazing, but does it really help the bats? 00:00:55
Oh, yes, it does. A bat can tell the speed and direction of a moving object, 00:00:58
whether it's alive or not, even if it's hard or soft. 00:01:02
In fact, in a perfectly dark room very much like this, 00:01:05
a bat can fly through without running into a moving wire that's as thin as a human hair. 00:01:08
In fact, a big brown bat can catch up to 600 mosquitoes in one hour. 00:01:14
600 mosquitoes an hour? 00:01:19
Doesn't that seem incredible? 00:01:21
Yeah. 00:01:22
Thanks, Mrs. Lewis. That was so fun. 00:01:23
Thanks. 00:01:25
Bye. Good luck. 00:01:26
Bye. 00:01:27
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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:
628
Fecha:
28 de mayo de 2007 - 15:32
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
01′ 28″
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:
8.84 MBytes

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