That night, after Ye Ning had cultivated, his consciousness entered the body of the bat clone Xiao Hei and flew in the forest.

Every few days, Ye Ning will adapt to the three clones again, because the doppelganger's ability has become stronger, and the control will be different, if you want to give full play to the doppelganger's ability, you must have a clear understanding of the limits of the doppelganger's ability.

"Whoosh"

Ye Ning flew over like a big black bird, as usual, emitting ultrasonic echolocation, and there was a disadvantage when his body became larger, that is, there were more obstacles invisibly, but the ability of ultrasonic echolocation has also improved a lot, so in general, it is just as easy to fly.

"Buzz"

A burst of ultrasound was emitted, which could not be heard by human ears, and could only be heard clearly with the help of bats' hearing, and when the echo came back, a pitch-black scene in front of him was like a three-dimensional image, presented in Ye Ning's mind.

However, this time, Ye Ning failed to adapt to the bat's ability after growth, and the ultrasound emitted was so strong that he heard some tinnitus.

What surprised him even more was that many mosquitoes in front of him suddenly fell to the ground.

"What's going on, ultrasonic attack?"

Looking at the mosquitoes all over the ground, Ye Ning was stunned for a moment, and then ecstatic in his heart.

I didn't expect ultrasound to have such a function.,If this attack ability is used well.,It's a killer move.。

In order to master the ultrasonic attack he inadvertently used just now, Ye Ning began to try, but after trying for a while, he failed to exert the insecticidal effect just now.

"Maybe it needs a fixed frequency or amplitude to be useful."

Ye Ning didn't try blindly, but first let his consciousness return to his body, open the old computer in the room, and check the Internet.

This check frightened Ye Ning, it turned out that according to the change of ultrasonic frequency, so many functions can be realized, and there are many applications in medicine, military, industry, and agriculture, which can be used for distance measurement, speed measurement, cleaning, welding, stone crushing, sterilization and disinfection, etc.

Ye Ning focused on the military use, that is, ultrasonic weapons, which have two main functions.

One is to emit sound waves with the same natural frequency as a certain object, using the principle of resonance, it can shake glass, tanks, submarines, fighter jets and other objects into pieces, but this function is still developing even in the military, it is difficult to achieve, Ye Ning wants to use it, it is not realistic.

The second is to use high-energy ultrasonic generators to generate high-frequency sound waves, causing strong air pressure and causing people to have physiological reactions such as blurred vision and nausea, so that the combat effectiveness of personnel is weakened or completely incapacitated, and even more serious deaths are caused. Even if you hide in tanks and bomb shelters, it can even pass through 15 meters of concrete walls and tank steel plates.

Ye Ning also sorted it out according to other industrial and medical uses, and deduced several principles that ultrasound is harmful to the human body.

For example, the principle of ultrasonic humidifier, the ultrasonic wave into the water tank, the violent vibration will break the water in the tank into many small droplets, and then use a small fan to blow the droplets into the room, you can increase the indoor air humidity, if you use this function, act on the blood in the human body? If the blood in the human body turns into a mist, the damage to the body can be imagined.

For example, the mechanical effect of ultrasound, ultrasonic vibration can cause the movement of substances in the tissue cells, due to the subtle massage of ultrasound, the cytoplasm flows, the cell oscillates, rotates, rubs, and thus produces the effect of cell massage, also known as "internal massage", which is the unique characteristic of ultrasound therapy. But there are two sides to everything, and if these "internal massages" are too strong, how will the body react?

Another example is the ultrasonic warming effect, the human tissue has a relatively large absorption ability of ultrasonic energy, so when the ultrasonic wave propagates in the human tissue, its energy is continuously absorbed by the tissue and becomes heat, the result is that the temperature of the organization's own body rises, which can be used medically to increase blood circulation, accelerate metabolism, improve local tissue nutrition, and enhance enzyme activity, but if the thermal effect is too strong, the temperature rises too high?

……

Of course, the general inferences in industry and medicine are only theories, and whether they are really valid or not remains to be verified.

Ye Ning didn't dare to think about it now, so he honestly used the principle of ultrasonic weapons to try and achieve this step.

Ye Ning's consciousness entered Xiao Hei's body, tried again, and turned up the frequency of the ultrasonic wave little by little, and after half an hour, there was a sudden "buzz" sound, and the air in front of him seemed to tighten suddenly, followed by a large number of mosquitoes falling to the ground.

Ye Ning was happy in his heart, this time he remembered this frequency, such a frequency would make him not very comfortable to listen to, but it was just as if people were uncomfortable when they heard louder sounds, and there was actually no harm.

Ye Ning tried to continue to increase the frequency, and found that within his ability, the higher he went, the more powerful he became, but the greater the impact on himself.

"I don't know how much damage this kind of ultrasonic attack does to people?"

Ye Ning wanted to try it, but it was not good to use people to try it casually, in case he killed an innocent person, it would be a sin.

He flew through the forest to search, and he had the impression that there were many wild beasts in this area, squirrels, rabbits, and wild boars, although animals were different from people, but for the damage of ultrasound, it should be similar.

Bats can fly, so it's much easier to find, and Ye Ning quickly found two fat wild boars, which were lying down and sleeping.

"Buzz"

Ye Ning approached, emitting an ultrasonic wave, and the air in front of him suddenly tightened.

The two boars, both of them opened their eyes suddenly, and then made a rapid cry, and got up in a hurry, but they were unsteady and staggering on their feet.

"Seems to work pretty well."

Ye Ning emitted a stronger sound wave, and the two wild boars screamed even more panicked, crawling on the ground for a while, and then foaming at the mouth and fainting.

This effect makes Ye Ning very satisfied, because the bearing capacity of wild boars should be stronger than that of ordinary people, that is to say, it is not difficult to faint ordinary people directly, if the other party is a soldier, boxer, bodyguard or the like with strong physical fitness, even if it can't be stunned directly, it will definitely have a great impact.

Moreover, this attack range is quite large, that is to say, it is a group injury, and once used, the opponent's collective strength can be greatly reduced.

In addition, this attack ability is not limited to this, and when the realm is improved, this ability should also be improved.

"Xiao Hei has a special attack, I don't know if there are little foxes and Gu worms?"

Ye Ning paid attention to the little raccoon dog and Gu worms, hoping to dig out their special abilities.

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