Sound boom in US Navy Blue Angels shows

来源: xia23 2023-10-28 07:11:09 [] [博客] [旧帖] [给我悄悄话] 本文已被阅读: 次 (7852 bytes)
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Sonic boom is an impulsive noise similar to thunder. It is caused by an object moving at the speed of sound -- about 343 meters per second or 767 miles per hour at sea level and at 68 degrees Fahrenheit.  

When two objects reach the same frequency, a phenomenon in physics called resonance occurs.

Resonance is a phenomenon that occurs when an object or system is subjected to an external force or vibration that matches its natural frequency. When this happens, the object or system absorbs energy from the external force and starts vibrating with a larger amplitude. https://en.wikipedia.org/wiki/Resonance?

Resonance, could happen in your daily life. For example,  you turn your faucet on slowly, gradually turn the faucet handle up, so water flows out with increased speed. At a certain point the flow speed reaches the natural frequency of the copper pipe. We could hear a laud vibration sound of the pipe. Once my landlord was at this scenario, she was scared and wanted to call a plumber, I said "turn your faucet handle either up or down, you will not hear this sound any more". She did and the vibration stopped.

I asked Bard, tuning a radio station, is it a phenomenon of resonance.

Bard answer:

Yes, tuning a radio station is a phenomenon of resonance. Resonance is a phenomenon in which an object or system absorbs or emits more energy at a certain frequency than it does at other frequencies. This is because the object's or system's natural frequency matches the frequency of the incoming energy.

Radio stations broadcast their signals at specific frequencies. When you tune your radio to a particular station, you are adjusting the resonant frequency of the radio's receiver circuit so that it matches the frequency of the radio station's signal. This allows the radio to receive the signal from the radio station and reject signals from other radio stations.

Radio receivers typically use an LC circuit to tune to a specific frequency. An LC circuit is a circuit that consists of an inductor (L) and a capacitor (C). The resonant frequency of an LC circuit is given by the following equation:

f_r = 1 / (2 * pi * sqrt(L * C))

where:

  • f_r is the resonant frequency in hertz (Hz)
  • L is the inductance in henrys (H)
  • C is the capacitance in farads (F)

By adjusting the inductance or capacitance of the LC circuit, the resonant frequency of the circuit can be changed. This is how radio receivers are able to tune to different radio stations.

As another example, a bridge collapsed in 1850, it was also a resonance event:

https://en.wikipedia.org/wiki/Angers_Bridge

 

9 Everyday Examples Of Resonance:

https://studiousguy.com/everyday-examples-of-resonance/

 

In an air show, this could also happen. When the jet reach the speed of the sound, you will heard a boom (the sound boom) and you will also see a cone- shaped cloud if there is enough water vapor in the air. It happened that the days were all cloudy when all my pictures were taken.  

On leveled photos (3 continuous shots, 2007):

 

On a chopped, sharpened photo (2008):

On a chopped, sharpend photo (2009):

On youtube (not mine):

 

 

所有跟帖: 

Thanks for sharing resonance in our daily life & an air show -盈盈一笑间- 给 盈盈一笑间 发送悄悄话 盈盈一笑间 的博客首页 (0 bytes) () 10/28/2023 postreply 07:30:39

"When the jet reach the speed of the sound, you will heard a -盈盈一笑间- 给 盈盈一笑间 发送悄悄话 盈盈一笑间 的博客首页 (0 bytes) () 10/28/2023 postreply 07:31:44

a boom. and you will also see a cone- shaped cloud if there -盈盈一笑间- 给 盈盈一笑间 发送悄悄话 盈盈一笑间 的博客首页 (0 bytes) () 10/28/2023 postreply 07:32:23

is enough water vapor in the air." -盈盈一笑间- 给 盈盈一笑间 发送悄悄话 盈盈一笑间 的博客首页 (0 bytes) () 10/28/2023 postreply 07:32:48

That sounds like fun. I will keep an eye on this phenomenon -盈盈一笑间- 给 盈盈一笑间 发送悄悄话 盈盈一笑间 的博客首页 (0 bytes) () 10/28/2023 postreply 07:35:43

when I go to air show next time. -盈盈一笑间- 给 盈盈一笑间 发送悄悄话 盈盈一笑间 的博客首页 (0 bytes) () 10/28/2023 postreply 07:36:06

There is usually once in each air show, -xia23- 给 xia23 发送悄悄话 xia23 的博客首页 (277 bytes) () 10/28/2023 postreply 09:26:08

Also watch that youtube video, catch the moment and -xia23- 给 xia23 发送悄悄话 xia23 的博客首页 (263 bytes) () 10/28/2023 postreply 09:38:47

Thanks for the tips. -盈盈一笑间- 给 盈盈一笑间 发送悄悄话 盈盈一笑间 的博客首页 (0 bytes) () 10/28/2023 postreply 10:15:34

精彩,不过这逆光几乎看不出是BlueAngel涂装,但轮廓肯定是FA-18F SuperHornet -移花接木- 给 移花接木 发送悄悄话 移花接木 的博客首页 (0 bytes) () 10/28/2023 postreply 08:01:56

这样不是更酷嘛。有艺术感。前3张照片, 应该是文青们的茶。。 -盈盈一笑间- 给 盈盈一笑间 发送悄悄话 盈盈一笑间 的博客首页 (0 bytes) () 10/28/2023 postreply 08:12:00

谢谢,since this happened many years ago. -xia23- 给 xia23 发送悄悄话 xia23 的博客首页 (100 bytes) () 10/28/2023 postreply 09:32:37

It doesn't have to take sonic speed to yield/show the cone -Marauders- 给 Marauders 发送悄悄话 (240 bytes) () 10/28/2023 postreply 08:06:22

看来是物理大牛。。 -盈盈一笑间- 给 盈盈一笑间 发送悄悄话 盈盈一笑间 的博客首页 (0 bytes) () 10/28/2023 postreply 08:10:34

Thank you. -xia23- 给 xia23 发送悄悄话 xia23 的博客首页 (0 bytes) () 10/28/2023 postreply 09:09:00

But I doubt. If it happens in this case, I could watch and -xia23- 给 xia23 发送悄悄话 xia23 的博客首页 (146 bytes) () 10/28/2023 postreply 10:35:51

All I am saying is that -Marauders- 给 Marauders 发送悄悄话 (389 bytes) () 10/28/2023 postreply 22:19:23

谢谢。 I agree that could happen. But that might not be -xia23- 给 xia23 发送悄悄话 xia23 的博客首页 (270 bytes) () 10/29/2023 postreply 06:22:56

Is it true that resonance could bust bridges? -7grizzly- 给 7grizzly 发送悄悄话 7grizzly 的博客首页 (0 bytes) () 10/28/2023 postreply 09:30:41

Yes. There is a case, -xia23- 给 xia23 发送悄悄话 xia23 的博客首页 (197 bytes) () 10/28/2023 postreply 09:46:04

fascinating! -7grizzly- 给 7grizzly 发送悄悄话 7grizzly 的博客首页 (0 bytes) () 10/28/2023 postreply 09:53:06

Sound barrier In wikipedia, -xia23- 给 xia23 发送悄悄话 xia23 的博客首页 (178 bytes) () 10/28/2023 postreply 10:10:48

Imagine Chuck Yeager's nerve breaking the sound barrier. -7grizzly- 给 7grizzly 发送悄悄话 7grizzly 的博客首页 (0 bytes) () 10/28/2023 postreply 10:14:54

It could happen at any Mach. -xia23- 给 xia23 发送悄悄话 xia23 的博客首页 (0 bytes) () 10/28/2023 postreply 10:46:43

Thanks for sharing such daily-life application of resonance -方外居士- 给 方外居士 发送悄悄话 (0 bytes) () 10/28/2023 postreply 11:34:50

You are welcome. Tuning a radio station is also a resonance. -xia23- 给 xia23 发送悄悄话 xia23 的博客首页 (5802 bytes) () 10/28/2023 postreply 12:39:30

So cool :) -Oona- 给 Oona 发送悄悄话 Oona 的博客首页 (0 bytes) () 10/28/2023 postreply 12:06:12

Thank you. -xia23- 给 xia23 发送悄悄话 xia23 的博客首页 (0 bytes) () 10/28/2023 postreply 12:40:07

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