You Might Not Know this about Arc Lighters | Random Video Thursday's

[@iaadsi]

That dB measurement is pointless, phone microphones have high attenuation at these frequencies and the audio ADC is most likely running at 48 kHz, which further skews the result down. It is harmless though, and readily scattered by air, dust and even hair in one's ears.

[@GrowingAnswers]

Are you saying the dB would be more accurate with a higher resolution? Such as a dedicated meter? The sample rate is still well above the produced frequency. I do agree that smartphone audio is highly processed though. And it’s not a great tool for sound quality measurement. The point here is just to demonstrate what it does though. I could possibly use my higher quality recording equipment for better measuring.

[@iaadsi]

Due to the Nyquist theorem you need at least twice the sampling frequency to properly sample a sine wave, so the 34kHz sound, assuming it's pure sine, would only start to be measured without aliasing with an ADC running at 68 kHz. Sound from high frequency sparks is not sinusoidal, there are going to be harmonic components going well into single digit MHz, so you'd have better success with an oscilloscope rather than audio equipment. But regardless, the higher the frequency, the less it penetrates, which makes it safe enough :)

[@ddegn]

I doubted the dB measurement myself. It sounded much louder (when slowed down). It was a really interesting video.

[@GrowingAnswers]

@@ddegn I would never rely on a smart phone for true measure. It’s more of a crappy gauge. Although it does extremely well at measuring Lux. I measured full moonlight and it was exact. My dedicated lux meter would not even register. It’s sort of a Jack of all trades and master of none.

[@gutrali]

I think the designers choose the oscillation frequency to be just outside of our hearing on purpose. Also, you can hear how disruptive it is if you use noise cancelling headphones. The headphone mics really can't process the noise well. The same happens even more dramatically if your ANC headphones are within earshot of an ultrasonic cleaner. These higher frequencies are also hardly ever heard by those over 30 years old. Younger people can hear the "hum" or "buzz" a lot better... It's definitely loud.

[@stickmanbrains]

Human hearing range is about 20-20k Hz

[@scottdvdr]

I wonder if that's what is actually happening when people think their cats are looking at ghosts n stuff. trippy! Really well done video btw

[@zetnakatel]

I've always wonder what kind of light spectrum this arc emits. Didn't find any information on the internet and I'm afraid it can be UV-C.. always when using that kind of lighter I wonder if I can look at it or better not, like with welding which emits UV-C

[@GrowingAnswers]

It probably emits a very small amount of UVC. I don’t believe it is quite bright enough to cause any harm to the eyes though if it does.

[@tonywharton5220]

Very interesting. Did you know that men can hear sub bass very clearly with full affect Unfortunately female hearing doesn't go as low as a mans as they are missing a bone in the ear.

[@GrowingAnswers]

I didn’t know that.

[@ParisLuHv]

Females have developed the ability to isolate/hear higher frequencies. Essentially allowing them to isolate the sound of their crying babies... Which is why the mother usually wakes up/reacts first.

[@porquee]

Such lil cuties

[@matthewsmeds101]

Man you went full on beard guy. Grow on! WTF is that thing? You know them' 4' LED bar lights I spoke of needing years ago? Guess what?

[@Haliotro]

Interestin