How to turn sound into light (then back into sound) - Part 6 of 7: Here's how it works

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Exploratorium Senior Scientist Paul Doherty demonstrates a fun hands-on activity for exploring circuits and sound, using an old radio, a solar cell and LED, and a speaker. This video explains the science involved.
The Exploratorium Teacher Institute (TI), the professional development arm of the Exploratorium, has worked with middle school and high school science teachers since 1984. TI offers a rich mix of hands-on activities based on Exploratorium exhibits, content-based discussions, classroom materials, Web-based teaching resources, and machine shop experiences through our Summer Institute, Saturday workshops, alumni workshops, teacher induction programs and more. Learn more at www.exploratori....

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1 окт 2024

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Комментарии : 45

@Lalit_Gaur 5 лет назад

This is how NASA scientist converted light waves in to sound to the hear the sound of Sun.

@rajharsh3114 6 лет назад

I do not think that this is conversion of sound into light. This is merely a utilization of the electricity supplied by the headphone jack to light up an LED connected to it, with the support of a battery no less. Conversion of sound to light means something completely different in my book.

@rajharsh3114 6 лет назад

I would also like to add that the LED was on even without the connection to the radio, thus implying that a comment made by an individual here saying that battery did not power it up on it’s own is wrong. And I do not see the brightness change, at all. I have been pondering recently whether it is possible to change one form of electromagnetic energy/radiation into another as all of them are the same, i.e; electromagnetic waves. The only difference is their wavelength, which if could be manipulated will result in conversion. This is nowhere close to what I was thinking of. This is simply extrapolation of electricity through radio waves (or maybe not, if that is a battery-powered radio) and usage of the generated electricity to power an LED, which was already lit up, with a battery.

@MrThe1234guy 6 лет назад

Yeah but he made it sound so convincing like he knew what he was talking about LOL. The next mr. Wizard

@lawrencemorris2261 2 года назад

Yeah, I was expecting there to be an "audio cell" the same way as the "solar cell" he depicted around 1:15. This isn't the same thing.

@manar91space 7 лет назад

can you please describe how the sound preserve its identity when converted into light and then light keeps its identity when converted into sound again?

@nazra7 6 лет назад

Your title is misleading. This is not turning sound into light, its turning sound into alternating electrical current which is then used, with an extra direct current source, to light a bulb...You do realize you can create a floating cloud of visible light just by playing the right frequency of sound loud enough into the air right? But what I want to know is what frequency range does visible light start and end at and how to make a audio device play that frequency? Do you know? And can you also tell me what converting (or even how to convert) the start and end of the frequency range for visible light into a number such as "x per second/minute"?

@thunderstudios7020 4 года назад

Hey dude u r misleading us , u need to remove the aligator clips of the radio signals and then show how the light is onn what the hell that battery is doing there, ur main agenda is to light the bulb, rather u r giving a power backup with battery, 𝙖𝙡𝙡 𝙨𝙝𝙤𝙪𝙡𝙙 𝙘𝙝𝙚𝙘𝙠 𝙤𝙪𝙩 𝙖𝙩 𝙩𝙞𝙢𝙞𝙣𝙜 0:45 𝙨𝙚𝙘 , 𝙖𝙛𝙩𝙚𝙧 𝙨𝙚𝙚𝙞𝙣𝙜 𝙩𝙝𝙚 𝙚𝙣𝙩𝙞𝙧𝙚 video, and then judge how is it going on, am in class 10 and I could notice it it's quite basic, and I think there r some reaserch scolars seeing these who wold agree with me

@MC-Minority 10 лет назад

Oh my god this is sick. Wish I learned this in physics.

@MISTERGUY1218 7 лет назад

same

@mastersushi5495 4 года назад

Guys is this real!? Plz answer guys with proof like u saying that u tested it because I need to do it for science fair next week but I Gtg do some other work.

@MrTunisien2010 10 лет назад

Hi, How sensitive should be the solar panel to be able to capture such small amount of light

@gatefitz1962 3 года назад

I have already seen an experiment on your site with a flashlight instead of a led, I know that there was a modification to be made on the flashlight, a coil I believe. Anyone have an idea where I could find this lab

@punishedproduct 3 года назад

Thank you! You just made a complex video simple🤣

@saiphanindra4711 9 лет назад

This is fish most of the energy (entire energy) comes from that 9V battery.....

@fouzansiddiqui3932 7 лет назад

the battery is providing only the DC supply...the LED has a varying brightness due to the sound signal (which would not be possable with the battery)

@mubarkal_sane1493 Год назад

Is that really 😮🎉

@Royed 3 года назад

...I wonder how effective this would be at making biofluorescent proteins into a "song".

@edouards6547 5 лет назад

Ok but i don’t get it. In this, the colour is arbitrary. You chose a red led and so the current gets passed on to the circuit and makes the red led shine. What i don’t understand is how astronomers used radio waves to create the image of the black hole, whereas you explain how to create a current. If someone could explain i would very much appreciate.

@boiseaquariums 5 лет назад

I dont care about peopls comments. Your video is pretty neat, thanks.

@shanitamenso2682 7 месяцев назад

Can you speak into a microphone or have sound go into one and store that charge ?

@pingajay1 7 лет назад

So Kool !!

@MICKIIYIII 6 лет назад

Wow , trust i have studied all this and was very good at understandin all the logics - now it all goes above the head lol

@podcast-this26 Год назад

is there a parts list to try the idea my self ?

@meinfraulein380 3 года назад

if that is infrared light i may believe

@gualtergutierrez1166 7 лет назад

and u can make a radio without batteries so its even more great

@MrThe1234guy 6 лет назад

You should show us with a multimeter that the sound is giving us any power at all. Because I call BS. There is no power coming from the sound. The light comes on because of the battery. What sort of sorcery is this!

@fouzansiddiqui3932 7 лет назад

that was one freakingly great idea...gotta try in college

@trigonomaterymathmatics3497 3 года назад

Good

@bishalsubedi4444 4 года назад

This is lifi technique

@عيشهاصح-ق6ك 4 года назад

you are genius

@TaigiTWeseFormosanDiplomat 5 лет назад

WOW

@ppcreations372 5 лет назад

Super

@tigerrobinson2518 7 лет назад

cool

@venkataramanak7866 5 лет назад

Resistor value plz

@DiboraBinebeb 5 лет назад

470 ohms 1/2 watt

@yarrwoiyess 7 лет назад

perfect, this so amazing

@thunderstudios7020 4 года назад

How did u get it lol, r u in ur conditions I mean r u alright he is just misleading us, why would we need batteries when we r converting sound into light

@joss1507 10 лет назад

if i swapped the radio into a microphone and played music into it would the light still come on?

@kalinko0o 8 лет назад

With the radio attatched he just put noises into the system that make the LED brighter... like little peak on the voltage that supply the LED. if you attach your mic instead of radio every time you make noise the bulb will get brighter and thats all...althought the mic output voltage is way smaller than this radio so it will be almost hard to see with naked eye;] ( like 94 dB of sound that normaly can make you deaf can generate around 20mV which is almost invisible difference on the emited light) Basicaly this video show nothing but convertion of energy ...it would be way more interesting if you had implemented some system that recognizes the bulb fluctuations and this way the other radio catch the diming signal as radio wave (wink) .