Su Qiyue spoke dryly on stage, and the effect did not seem to be ideal.

After all, the soldiers of the army cannot be compared with the students of the school!

He had no choice but to try to use some examples that were close to the life of the army to attract everyone's interest.

"Electromagnetic waves, i.e. alternating electromagnetic fields that propagate in space. It travels at a speed of about 300,000 kilometers per second in a vacuum. ”

"Radio waves, infrared, visible light, ultraviolet rays, X-rays, and γ rays are all electromagnetic waves, but they are generated in different ways and at different wavelengths, and they are arranged in the order of wavelength (or frequency) to form the electromagnetic spectrum."

Su Qiyue's eyes looked around, and then said: "The radio we usually use is electromagnetic waves with wavelengths ranging from a few thousand meters to about 0.3 meters...... Someone should know about this, right? ”

Hearing this, a first-class non-commissioned officer below nodded and said, "Teacher Su, I know!" I went to the regimental headquarters communication station. The walkie-talkie used for the communication of our 702nd regiment is transmitted through radio waves. ”

Seeing that there was finally someone who understood, Su Qiyue's face was overjoyed.

He bowed his head and said: "That's right, the working frequency range of military communication equipment, usually 136~150/400~420MHz, belongs to the category of radio waves. ”

"We receive radio waves through some listening tools, and then convert these electromagnetic waves into electrical signals through the electrical system. Finally, the electrical signal is sent to the speaker and converted into sound waves that our ears can receive. ”

"By understanding the principles of the conversion of radio waves and sound waves, we can do a lot of things...... For example, the use of electronic jamming to disrupt enemy communications. Just like the last time we conducted a confrontation exercise with Regiment A, our regimental communication company did it. ”

When Su Qiyue said this, the "students" below all came to their senses.

In last year's exercise, the communications company of the 702nd regiment gained an advantage on the battlefield by jamming the communication frequencies of regiment A.

Among them, the early investigation of the Seventh Steel Company played a very key role.

Seeing that everyone's interest was gradually strong, Su Qiyue continued to talk about it.

"Now that we've talked about the concept of sound waves, let's talk about infrasonic again."

As he finished speaking, the door at the back of his office was gently pushed open.

The next moment, instructor Hong Xingguo and an officer with the rank of captain walked in slowly.

Seeing these two people appear, Su Qiyue just wanted to say hello, Hong Xingguo quickly waved his hand at him, signaling him to leave the two of them alone, and then continued.

Su Qiyue thought about it for a while, and had almost guessed what was going on.

Needless to say, it must have been the company commander or instructor of which company got the letter and wanted to come over to "audition" his lesson.

Thinking that he might have a few more students, Su Qiyue was a little funny.

Of course, after laughing, he quickly returned his attention to the lecture.

"The sound that we normal people can hear every day is sound waves in the frequency range of 20-20,000Hz. This kind of sound wave is also called audible sound wave. ”

At present, the most widely used in the military field is the infrasonic part. That is, sound waves with frequencies below 20 Hz......"

Su Qiyue said eloquently: "Compared with audible sound waves, when infrasound waves propagate in the medium, the energy decays slowly, the concealment is good, and it is not easy for the enemy to detect. Therefore, infrasonic receiving devices are commonly used in the military to reconnoiter the enemy's situation. ”

"In addition to this, infrasonic weapons are also used for a purpose, and at some point, they can even be used directly to destroy the enemy's living forces."

Hearing this, the face of the captain beside Hong Xingguo changed slightly.

Obviously, he was very interested in the topic that Su Qiyue was talking about at the moment.

Hong Xingguo looked at his words, then coughed and said, "July, you can give you a few specific examples." It's on the application of this infrasonic weapon! ”

Su Qiyue didn't expect the instructor to speak suddenly, so he hurriedly agreed.

"When it comes to why infrasonic weapons can cause lethality to people, it involves another important concept in physics - resonance."

"Infrasound weapons, in fact, use infrasound waves with similar natural frequencies to human organs to resonate with human organs, causing organs to deform, displace, and even rupture, in order to achieve the purpose of killing."

Speaking of this, Su Qiyue paused for a moment before he continued: "Infrasound weapons, according to their objects, are roughly divided into two categories. One is neurotypic and the other is organotypical. ”

"Neurological infrasound weapons with frequencies close to the alpha rhythm of the human brain (8-12 Hz). Therefore, when infrasound waves act on the human body, they will stimulate the human brain and cause resonance, which will have a certain impact on people's psychology and consciousness. ”

"The result is dizziness, nausea and other discomforts; In severe cases, it can also cause nervousness, shock, fainting, and even loss of thinking ability. ”

Listening to Su Qiyue's rather novel narration, the "students" below sat up straight one by one, for fear of missing something.

After successfully attracting everyone's attention, Su Qiyue turned the topic back and told everyone a few simple test questions about sound waves.

With the previous foreshadowing, the students easily gave the answers to these questions.

The captain in the last row listened to Su Qiyue's explanation with great interest.

When Su Qiyue announced the end of the morning class, the captain took the lead and stood up and applauded.

"Lao Hong, you really picked up a treasure! Let's go talk to him! ”

Looking at this such a clear attitude, Hong Xingguo was happy and worried.

But there was no way, since they proposed to talk to Su Qiyue, Hong Xingguo could only agree.

"Su July!"

Hong Xingguo stretched out his hand and beckoned to Su Qiyue, who was being embraced.

"Here!"

Su Qiyue said hello to several students around him, and hurriedly walked in front of Hong Xingguo and the captain to salute and say hello.

"Hello Chief!"

The captain smiled and waved his hand, "I'm not a chief. Comrade July, I listened to the content of your lecture just now, and it was really interesting. ”

"Originally, when the head of the regiment asked me to come to your company to ask for help, I was still in a fog and didn't know what it meant. Now, I finally get it! ”

Listening to the captain's words, Su Qiyue was a little confused.

Seeing this, Hong Xingguo, who was next to him, hurriedly explained: "In July, this is Staff Officer Huang of the Operations Department of our 702nd Regiment. This time I came to apply for the non-commissioned officer school examination of our regiment, and I came to our company to guide the work. ”

Staff Officer Huang waved his hand again and again and said, "Lao Hong, don't dare to guide the work. I'm here this time, I'm asking for help. ”

Turning his head to look at Su Qiyue, Staff Officer Huang said with a hint of joy: "The regiment commander's acceptance rate for our regimental non-commissioned officer school this time, the death order given to me must be at least fifty percent. ”

"Originally, I still had a headache, how to complete this task. After listening to your lecture just now, I feel hopeful! ”

Hearing Staff Officer Huang's emotion, Hong Xingguo next to him showed a helpless smile on his face.

He knew that this top student in his company had to contribute again.