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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Why? Files segment explaining how a sonic boom results from air pressure changes.

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Oh, hi kids. I'm Dr. Darden, an engineer here at NASA Langley Research Center. I've done 00:00:00
sonic boom research here for many many years. What's a sonic boom? Doesn't it have to do 00:00:10
with the speed of airplanes? Yes it does. A sonic boom occurs when an airplane travels 00:00:15
faster than the speed of sound. We do lots of sonic boom testing in this wind tunnel. 00:00:21
In fact, the first models that we used were no larger than my fingernail. When an airplane 00:00:28
travels through the air, it generates pressure waves that travel at the speed of sound in 00:00:34
all directions. A plane flying at the speed of sound moves at the same speed as the disturbances, 00:00:38
causing a shock wave to form. When the plane flies faster than the speed of sound, this 00:00:44
shock wave forms a cone shape attached to the nose of the airplane. Air pressure just 00:00:50
inside the cone is high, and air pressure ahead of the cone is normal. This shock wave 00:00:56
or cone extends to the ground, perhaps 10 to 15 miles. The sonic boom is heard when 00:01:02
the sudden change in pressure crosses your ear. Let me demonstrate for you with this 00:01:08
balloon. The air pressure inside this balloon is higher than the air pressure outside the 00:01:13
balloon. If I pop the balloon, a shock wave is generated much like a sonic boom. Could 00:01:18
there be a very high frequency sound that people can't hear but dogs can? Absolutely, 00:01:24
but remember that very high frequency sound can't come from far away. Because high frequency 00:01:30
sounds don't travel very far. That's right. Thanks, Dr. Darden. You're welcome. Goodbye 00:01:35
and good luck. 00:01:41
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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:
576
Fecha:
28 de mayo de 2007 - 15:32
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
01′ 43″
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:
10.44 MBytes

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