Let's talk about resonance first. Resonance is a very high-frequency technical term in physics, which refers to the situation that the vibration amplitude of a physical system at a certain frequency is greater than other frequencies. These specific frequencies are called resonance frequencies. At the resonant frequency, a small periodic vibration can produce a great vibration because the system stores kinetic energy. When the resistance is small, the resonance frequency is approximately equal to the natural frequency or natural frequency of the system, that is, the frequency when it oscillates freely. There are many resonance phenomena in nature, such as acoustic resonance of musical instruments, orbital resonance between satellites of some wooden planets in the solar system, resonance of basement membrane in animal ears and resonance of circuits. Humans also use or try to avoid resonance in their technology.
For example, the classic military step destroys the bridge, and infrasound hurts people because of resonance.
Similar resonance exists in the circuit (also called resonance), but the resonant frequency of the circuit network can be greater than 1.
To put it bluntly, the key to blowing cups is 1. Pronunciation should be as close as possible to the natural frequency of the cup. 2. Keep the pronunciation time and intensity.
But it is easy to say, but it is still difficult to do. People who have seen mythbusters should remember this experiment.
In the absence of an amplifier, it is possible to pronounce by vocal cords alone, but it is still difficult, and it is difficult for people without a musical foundation to do so.
Regarding holding the cup, it is actually because the bracket is not stable enough, which makes a lot of energy collapse and changes the natural frequency of the object itself.
abstract
1. It is difficult, which is related to the brain, but the mental difficulty is average. Pronunciation is a basic musical skill, and the biggest difficulty is to pronounce aloud continuously, but this is normal.
Gao made several logical mistakes. Pavarotti's failure doesn't mean impossible. Pavarotti's advantage is high frequency, which has nothing to do with the project. Pavarotti needs a microphone to sing, which shows his high conceit.