【四幸丸-聲波神器】Ultrasound 超聲波(頻率超過2萬赫),有人聽的到嗎?


Hello everyone, I am Si Xingmao teacher. I want to introduce this today. Ultrasonic What is ultrasonic? Frequency is higher than 20,000 Hz Then our ears A range of sounds that can be heard frequency Twenty to twenty thousand hectares If it is too high or too low We can’t hear the sound More than 20,000 Hz, the so-called ultrasound Let’s let everyone listen now. Start listening from low frequencies Ok, this is more than 300 frequencies. Change the frequency by sliding left and right Much like an alien approaching you 啾啾啾啾啾 I now go below twenty Hz Let you listen Is there a voice? Have you heard the sound? did not hear If you hear something, please leave a message for me. I went to the frequency of sixteen The frequency is sixteen, is there a sound? I can’t hear it either. The frequency turns a little higher Very harsh frequency We now turn to frequency, 18,000 kHz You listen, this voice Now the frequency is, 18,000 kHz Everyone can come and listen Is there a voice? Seriously, I can’t hear it. Have you heard it? Some can leave a message Hearing hand Really, I didn’t hear it. The frequency is heard at 10,000 Hz, and the frequency is heard at 13 kHz. I tried it last time, about half of my classmates I can’t hear it like me. Frequency, 18,000 kHz If you hear it, let you challenge Higher frequency 20,700 Hz frequency Ultrasonic, do you hear sound? I have not heard it, have you heard it? Everyone is different Last time the frequency was 1,800 kHz There are still several students who have heard Is there any problem with your ears? No relationship The frequency that everyone hears is not necessarily That ultrasound application introduce For example, submarines and fishing boats Can issue sonar Find the fish and the depth of the seabed Can also check Female’s fetus during pregnancy Ultrasonic cleaning machine, can wash glasses Doing dog flute Medically Bladder stones or kidney stones You can use the ultrasonic oscillator, can you shake the stone down? This is what we introduced today. Ultrasonic More than 20,000 frequencies I call it ultrasound That today’s introduction is here. Like my video, in the top right corner, you can subscribe by Or can help me share or press like Then we will see you next time, 掰掰

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