Chapter 373 Piezoelectric Effect (Please vote and subscribe)

Luo Chong quickly grasped a few key points. Thunderstorms in the plateau area, the elevation and vibration of the mountain, and the mountain fell back after the rain. The cracks must be caused by the elevation of the mountain, which is not included in the reference.

As for the terrifying screams coming from the cracks and caves described by Youye in the letter, he even suspected that there might be some ghosts below. This was automatically ignored by Luo Chong. According to his inertial thinking, he first tried to explain it with science, and then studied other explanations if it didn't make sense.

Then, in summary, the useful conditions are the two key points of "thunderstorm" and "the rise and fall of the mountain".

Did the thunderstorm cause the water level of the underground river to surge, causing the whole mountain to float?

Luo Chong quickly shook his head and denied this conclusion. How much water would it take to make the whole mountain float? Even if the underground river had a big flood, it would at most impact the mountain, causing some unnoticeable vibrations at most. Even the screams they heard might be the echoes of the torrents generated by the underground flood in the belly of the mountain.

Excluding the cause of rain, the only thing left is lightning. If we analyze it in this way, the "flash in the crack" may be explained. Maybe the lightning was transmitted to the inside of the mountain, causing some substance to react physically, thus causing the flash.

But this is still not the point. The point is that lightning caused the mountain to rise and fall. Well, to put it in a more scientific way, the mountain has deformed.

In this way, the information is a little clearer. Lightning caused the deformation of the mountain! ?

Luo Chong's judgment on this conclusion is also based on facts. This is not nonsense. Youye clearly stated in the letter that "the mountain began to rise after the thunderstorm, and fell back to its original position after the rain stopped." That is to say, this deformation process occurred when lightning occurred, and after the lightning disappeared, the deformation returned to its original state.

Luo Chong tried hard to recall the knowledge he had learned before. In physics, the deformation of objects caused by electric current should be the piezoelectric effect! ? It seems that only the term "piezoelectric effect" can explain it here.

Anyone who listened carefully in school should know that there is an electrical effect in physics, that is, applying external force to a type of object can cause the object to discharge, and this phenomenon is called piezoelectric effect.

Similarly, when this type of material is directly connected to an electric current, it will deform, that is, electrical energy is converted into kinetic energy. To put it bluntly, the deformation of the object produces an outward force.

And this reaction is called the inverse piezoelectric effect

. Well, although it sounds awesome, in fact, things that use this piezoelectric principle are everywhere in our lives, and we come into contact with a lot of them every day.

For example, a plastic lighter that costs one dollar, when we press the button on the back, the lighter will instantly release several thousand volts of electric sparks, igniting the liquefied gas that is sprayed out, and even many people have taken out the black piezoelectric device in the lighter to play with it.

In fact, this is the use of the piezoelectric principle. There is a very small piezoelectric ceramic installed in it. As long as pressure is applied downward, the ceramic piece inside will release current. Similarly, this physical phenomenon is also used in gas stoves for cooking.

As long as you press the switch button, the electrodes in the stove's fire pan will release electric sparks to ignite the natural gas. This is basically something that everyone can experience, and this is the piezoelectric effect.

But what Youye and his team encountered should be the reverse piezoelectric effect, that is, lightning causes the deformation of objects. Of course, there are many things around us that work on this principle. The most common one is the mobile phone, or to be more specific, the receiver and microphone.

The objects that use the piezoelectric effect the most are various crystals. Not to mention artificial piezoelectric ceramics, the naturally formed things are quartz, crystal, or crystals precipitated from metal minerals. Only these things will produce piezoelectric effects with electric current.

Take crystal for example. As long as this thing is connected to electric current, it will vibrate violently or slightly enlarge. Similarly, applying a certain force to the crystal can also make it generate electric current.

And crystal is very sensitive to "force" and "electricity".

For example, cut the crystal into a thin slice with a diameter of three or four millimeters and a thickness of a few millimeters, connect the positive and negative electrodes on it, and then connect it with other electrical appliances to generate a circuit.

Then put this device in a place, and a bee vibrates its wings more than ten meters away from it. This vibration can be captured by the crystal piece, and then the crystal piece generates current due to the vibration of the air, and finally the frequency of the vibration is displayed on the electrical appliance. As long as there are several sets of such devices to compare with each other, the size and direction of the target object, and even the distance, can be detected and captured.

Doesn't it look like sonar and radar? In fact, this is the principle of the piezoelectric effect.

Similarly, this thing is also used in microphones. When we speak into the microphone, the air vibration caused by the sound wave will be transmitted to the piezoelectric element in the microphone, and then the vibration force will generate different currents. Finally, the current is converted into an electrical signal through a radio transmitter and transmitted to another person's mobile phone. After the other end receives the current signal, it transmits this current to the crystal piece to deform it, and then the vibration of the crystal piece is transmitted through the air and becomes a sound wave. At the other end, the sound is perfectly reproduced. This is the reverse piezoelectric effect, that is, the crystal is deformed and vibrates when it is energized.

This thing is not only common in life, but also has many uses in the military. Not to mention radar, there are other uses such as the trigger fuse of bombs, which makes the crystal bear force through impact and then releases electric sparks, causing the internal explosives to explode, and there are also ultrasonic weapons.

In addition, there are many applications in medicine. By electrifying the crystal to produce deformation and induce vibration, it is used to make ultrasonic waves, B-ultrasound machines, and extracorporeal lithotripsy machines, all of which use the inverse piezoelectric effect.

Having said so much, and analyzing it in this incident, Luo Chong is very suspicious that there is a crystal vein with an astonishing reserve under the mountain. It may be quartz, or it may be crystal, or it may be alkaline salt crystals precipitated from metals, such as copper sulfide, iron sulfide or something like that.

These crystal mines received strong currents due to high-altitude thunderstorms, and then produced violent vibrations and deformations. A small piece may not have much power, but if the entire crystal mine vibrates and deforms together, it is really possible to lift the top of the mountain.

Then the question is, what kind of mine is this?

(End of this chapter)