In the recent issue of super brain, a contestant smashed a tall glass with his "Lion Roar", while Gao Xiaosong in the jury called it "unscientific" and questioned: "I am from science and engineering, so I want to see the real thing. I don't believe in the lion's roar only in books, which has nothing to do with the brain! If you can be super brain, then it is super brain who can split. " Gao Xiaosong's repeated questions caused the players to be dissatisfied: "I think this is beyond the cognitive scope of Teacher Gao."

*** Vibration frequency: Think about how to push the swing

Many years ago, Scientific American magazine reported that it described such a scene: "She walked calmly onto the stage, her chest swelled when inhaling, her lips parted slightly, and she spat out a series of shocking high-pitched notes, only to see the champagne glass broken, her glasses shattered, and the dendritic decorative lights burst."

Like all other substances on the earth, every piece of glass has a natural * * * vibration frequency. Once the external disturbance, such as the frequency of sound waves, matches it, it may make the glass vibrate greatly and even cause breakage. In the middle, glass bottles or glasses are particularly vulnerable, because they are hollow and approximate tubular bodies, which is why when you knock them, they make a ringing sound like bells. If a person sings with the same sound frequency as this "bell", the sound wave she/he emits will cause the air molecules around the glass to oscillate, and the frequency is the same as its vibration frequency, so the glass will also vibrate. And if the singer's voice is loud enough, the glass may be broken.

Physicists point out that although it is possible to break a glass with your voice, you must have a very loud voice and be lucky. If you can make the glass vibrate, it doesn't mean that you can break it. The occurrence of crushing depends largely on the existence of its original internal defects. Therefore, in order to ensure the success of the performance, it is best for the actor to carefully select a glass with tiny cracks and easy to break under vibration.

In fact, the surface of every material is covered with a lot of tiny cracks and fragments, but they are too tiny to be seen by human naked eyes. However, the shape distribution of these cracks can be very different. Two glasses that look exactly the same to the naked eye may have completely different strengths, so that one of them can withstand higher volume, but the other can't.

The principle is simple but difficult to operate: "loud voice" is the key

The physical principle behind "sound destruction means" seems not difficult to understand. But although it doesn't sound too difficult, in fact, it is extremely difficult to really break the glass with sound in real life.

So the lion roar is just a name.