miami is you guys remember me and i work for the boston museum of science and it's really fun for me to get to go around and meet new people all the time x for fun that i get to hang out with you guys two times in one year so i'm pretty excited because sounds around us ever get like raising and if you like music raise your hand if you play an instrument or anything like to sing there and if you just don't like music at all learn a lot about the physics of making sound and i plan on trying to get something to go faster than seven hundred seventy miles an hour in here yet so that would be really exciting and as a grand finale thing we're going to get to figure out is that true or is that not true and i just so happened to be hanging out with the offer saying years like to weekends ago at the boston lyric opera and i had them try and i'll tell you guys what so i finally got to really test if an opera singer can do it or not right so i'd love to get started and we're going to start out with thinking about what you stand and to do that we're going to do an experiment and i'm going to need t that he feels that but do you guys see the air like jumping around and doing cool things can you see the thing that i mean you see the tuning bar right but if you could see air imagine what it would look maybe at the end of give you a chance to wave yourself on camera but now is not the time is either i'm good with all right so sorry i have to grab my remote and to do that i want to do another model so i'm going to need someone who's going to represent a sound or i gave a vibration and let's see a good director coming up so this will be your instrument to we do have to pass the vibration i'm thinking more like humidity dominoes is where you say there is air underneath this thing so i have this set up in right now there are where the bows but she's going to ring the bell and i'm going to start to pull the air out of this container space and we're going to did i notice when i was like in the air back and it just felt like shriller and higher and higher yeah so i want to take one second to talk about the difference between volume and pitch so i want you to see and i want you to increase the volume of that no we'll talk more about that as we move along but now i want to talk about the speed of sound because you guys were so interested in her i think it would be something good to talk about right now in air so here's a good air and watch i looked up the numbers to see how fast it goes and i found that the air can let the sound vibrations go at seven hundred seventy focus i want you to vote do you think it goes faster or slower in the water raise your hand if you think it goes faster in the water good things go slower so the majority of people think yes exactly so basically if i give you guys the switch for the sun like a light switch and i said ok three to one turn up the sun it would take the sun eight minutes to turn up because it takes time and seventeen seconds because it takes time for make a guess of what might happen what do you think yeah no definitely not but if i use this thing the right way i can get the head so not to handle this part to get seven hundred seventy miles an hour what do you notice about the size of the text yeah yeah there are like tiny pieces of string now that handle and the physics behind it let it go that fast because of the shape and the transfer that energy so i have to find a good place to do this in here and you guys are not allowed to move your seat you're not allowed to stand you're not allowed to kneel but you can like turn your body to face wherever i am so i'm probably just i'm just going to walk around till i find what it is again because i need a good amount of room to do this so i'm going to you know the old i mean  the perfect place to do it would be where all the teachers oh yeah now i have some people at the museum who are super smart and can do this you don't have to be smart to do this you have to learn about how to do it or the sound so what i want you guys to know is when this is kind of the motion i bring it back this way and then i put it back over my head and everyone who was teaching me said no up right when the tip gets to the just before the ground that's when you go forward and like do you think you want to be turning around when there's like a long won't work if i do it too soon won't work so i might fail even now but i will try out so it is going to be a sonic boom so if you don't like last round you can buy for years i ok so there are some people out there who are so good with works that they can put out candles and myth busters decided that they were going to see if they can  so what i have right here is there's this like super high speed camera and it's focused on this is a candle so there's a candle there's the where the hot steamy air above the candle and when i press play you're going to see those little nylon strings at the tip at seven hundred seventy it's just passing that seven hundred seventy mark and we know that because we can see that it's breaking the sound barrier you ask her how loud that sound was with a little tip of the word great imagine the model of the sound you get from screen in your nose except thicker and right now is there any sound coming out of this right now my plan is to take heat energy and change it into you what kind of energy you think sound energy yeah so this thing is pretty interesting there's a lot of science that goes into making this thing work so for this i'm going that's the flame in the tube so we're waiting for something more interesting than that was there anyone who thought you were singing just that we have a few people who'd like to vote for singing so the way this illusion works i heard a talking but i'm going to play just the last part of it sometimes behave so strangely not change it but played again again again again again and at some point your ears will be going to see you singing it and when that happens to you i want you to raise your hand if it doesn't happen to you that's ok only raise your hand when and if it  changed your mind so if i play it the way you heard it the very first time we should all hear singing from now on so you supposedly just changed your brain and let's see if that worked and it's toward what we need to know how to do our grand finale so we're going to now is of course the wineglass but we need to learn something pretty important about how to break the wine glass using this thing like a plate i use this play it could have been a styrofoam paper would not work too well but it would work and you need to make a wire coil that can fit over the magnet so this red thing right there is a wire that i wrapped in a circle around construction paper and if i put on top of this magnet can you see i don't really know if you can see that well but it's those two business cards keep it so it's kind and i used some fancy museum stuff to get up but when i first did it i used a hot glue gun because they didn't have fancy stuff with me so you could do this with really simple material then you need to do is plug it in and is it going to be super loud no  you guys are going to have to help me figure out sorry teachers in the background ok so i'm going to plot the program and i'm going to play fire let's start with raise your hand if you think you can hear the ball's moving ever so slightly i'll turn it off so listen i think i can hear them but i'm going to ask you guys to watch them for when they boun seven hundred one it wouldn't work if you get seven hundred point five it would work so that how close that has to be so here's what the wind was sounds like let me put down my guest on my computer so this is what it sounds like do you think that's relevant who thinks that important what it sounds like right now who thinks maybe not ok so who thinks we just need a loud pirate who think moves the glass through the air so i'm not a great singer but sometimes i can get now and the opera singer didn't break it because i don't know if you guys have ever heard opera singers but you know it's like so like when they sing it has lots of different sounds in it and the different sounds make it impossible for them to break the glass you need just one straight note and singing like that hurts your throat and vocal singers people like opera singers don't want to hurt their throat because that's not good for their me it is powerful enough to melt in battle so we're talking pretty hard i'm going to tell you that is that it's somewhere between seven hundred and and when you think it's around where it should be you i mean not so you could use your fingers to tell me to go higher go lower but i'm starting at seven hundred all scroll the nine hundred and you watch for when it counts as around you have a question i'm not going to turn it off until you have a guess so it will be quiet and then we'll turn up all the way and we either work or walk back so here should be seven hundred movement but it has to be exact so who says i more vibrations he says down more people say up so i'll go out now and i'm fifty five sixty five this is eight fifty five and forty five so what are we just learn yeah so here is eight sixty five i'm going to turn the volume up a little because it's really low so i will be able to see the straw better return the vinyl i'm going to go buy one of those times eight sixty eight sixty seven does break if it is over really quickly and i can't really do it because it's got so if it doesn't break then we're going to try again i'm going to cover the top so that will continue the sound a little so the bad part is i can't hear if it's on or not so you guys are going to have to raise your hand when you think it's on you people in front of the speaker hear it and i would agree with that do you still hear it now ok so just so i can see if you're talking with truth or not i'm going to turn it on and turn it off and you raise your hand  all put it on camera so you can  see all right so when i first play it will be twenty thousand is you can watch the number and raise your hand when you hear it ok so i don't know about the chemical i can look it up and email you if you can do me if the teacher can give me an email that i can respond to that with because i have heard it so maybe it's i'd like to but i thought you guys had things to do i have one more question i'm going to take  what i'm good at what a good question he said would it be faster to steal it and why so are we making a sound like are you getting this or are you making it sound on the steel first or on the water first you know in the water so you re in the water you make it sound i mean it would still travel through the steel faster than the water but it wouldn't speed the water u something that only like a musical ear hears people at the museum a lot of them can't hear this but if i put it next to my ear this one goes like  and i used to sit on the ground and bring my losses for like three hours a week as part of my job people at the crate and barrel doesn't like me very much but if i can that you could break other things is the more of the story but you'd have to say that matters the height matters like every single glass this one has a different number than the one we just did it's so hard to repeat because once you break it it's done so watching like a space movie you can evaluate them if they're being good scientists or not because if you hear a like a spaceship zoom by is that accurate or not not if you are ever watching a movie and it's like why didn't that ship just make a sound that's because they were trying to be right with the side so i want everyone to give themselves around applause for doing tha never heard of that before i'll give your teachers my e mail address and if you guys have any feedback on the program and obviously love to hear it so we ask you guys to listen to your teachers because they're going to tell you what's going to happen next but they do you are so much