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More Frequency and Sound Travel

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Why? Files segment comparing the travel of high and low frequency sounds.

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Boys and girls, this is Dr. D. He's brought something really special to share with us 00:00:00
today. 00:00:07
Good morning. 00:00:08
Good morning. 00:00:09
I already have an experiment set up. 00:00:10
It's going to show you the difference between high and low frequency sounds. 00:00:12
Will we be able to see anything? 00:00:16
Not once you'll be able to hear it. 00:00:18
This machine is going to produce sounds at different frequencies. 00:00:19
I want you to raise your hand when you can't hear the sound anymore. 00:00:22
It's just going to give you an idea by high and low frequency sounds. 00:00:26
Here we go. 00:00:30
Oh, looks like we lost your teacher first. 00:00:49
I can't hear it either. 00:00:51
When you get older, you can't hear high frequency sounds as well. 00:00:52
Let's keep going. 00:00:55
Ah, no one can hear it now. 00:01:02
I bet your dogs can still hear it. 00:01:04
Now we'll need some volunteers. 00:01:07
I'll take you and you and you and you. 00:01:09
I'm going to transmit a low frequency sound to you. 00:01:15
PJ's going to put the phone between the speaker and your ear a couple of times. 00:01:19
Let's do it. 00:01:23
What happened? 00:01:25
The sound wasn't as loud. 00:01:26
Now I'm going to transmit a higher frequency sound. 00:01:27
What happened this time? 00:01:28
It seemed like the sound was blocked off a lot more. 00:01:29
Let's try it again. 00:01:30
Why don't you two switch places? 00:01:31
Okay. 00:01:32
Okay. 00:01:33
Okay. 00:01:34
Okay. 00:01:35
Okay. 00:01:36
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Okay. 00:01:55
Okay. 00:01:56
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Okay. 00:02:03
Okay. 00:02:10
Okay. 00:02:12
Okay. 00:02:13
Okay. 00:02:18
Okay. 00:02:20
Okay. 00:02:21
It became a little bit softer. 00:02:22
The book was the same distance both times. 00:02:24
Remember, with the scientific method, 00:02:27
you can only change one variable at a time. 00:02:29
I changed the frequency, 00:02:32
so I'm glad Jacob was careful to keep the book distance the same both times. 00:02:33
I think that low-frequency sounds travel better than high-frequency sounds. 00:02:37
Well, low-frequency sounds do bend around corners a lot easier than high-frequency sounds. 00:02:41
That's why the lower-frequency sound was a little clearer, 00:02:46
because it bent around the phone book. 00:02:49
This is so cool! 00:02:51
This experiment taught us that high-frequency sounds don't bend around corners very easily. 00:02:53
Don't forget what we learned about the bats. 00:02:57
How could we forget? 00:02:59
High-frequency bat calls don't travel very far. 00:03:01
What does all this mean? 00:03:04
Let's go back to our treehouse after school and think about it. 00:03:06
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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:
493
Fecha:
28 de mayo de 2007 - 15:32
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
03′ 10″
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:
19.07 MBytes

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