Tuning fork vibrations in super slow motion

[thawdani]

troll..science.

[catstuffer]

you need to use at least 4x AA for better picture :D

[deltaray3]

Thanks. the beginning of your video was very effective for explaining to my 4 year old daughter what a tuning fork is.

[DrDaveBilliards]

@deltaray3

Thanks.  That's the best compliment I've received in a while! It's not easy to please a 4-year old.

[gamehead91]

@DrDaveBilliards WHAT!?

[DrDaveBilliards]

@gamehead91

Is your exclamation/question in reference to the aliasing, or the mislabeling of middle C (see the video text description above)? Or is it something else?

[MrSnbryan]

sorry...!

[MrSnbryan]

actually 523,25 is C one 8ve above middle C40, known (in England) as C52 on a piano. Nicholas, Brazil.

[DrDaveBilliards]

@MrSnbryan

I actually have this info in the video description. I just said it wrong in the video.

Thanks.

[rasmasyean]

What about the contact point with the wood. What happens there? Apparenly that's where the "important effect" is since that's how you hear it. Can you make a video of that?

[DrDaveBilliards]

@rasmasyean

Very little happens at the contact point with the wood. There is very little motion because the tines are moving in a balanced fashion. Although, there is a slight fluctuation in force on the wood, which causes vibrations in the wood (which are too small to see with my camera).

[DrDaveBilliards]

The frequency is 523, the "C" an octave about middle "C."

Good idea about the ripples. Counting them and dividing by the elapsed time would give the frequency.

[eldrickenji]

just use a lower pitch fork for the high speed thing if you can't get more fps

[DrDaveBilliards]

@eldrickenji

but then I would need an elephant or whale to hear it. :) :) :)

[eldrickenji]

i can't provide that sorry

[clockprint]

I like how you discuss the Nyquist Frequency and aliasing as well. Great explanation.

[DrDaveBilliards]

@clockprint Thanks.

[prankstare]

nice

[creamball1004]

???????? thz weird.............

[DrDaveBilliards]

Thanks! :)

[charlie120asc]

it sounds like the .Hack// Sound!

[DrDaveBilliards]

What is ".Hack//"???

[charlie120asc]

An Anime And a game.

[DrDaveBilliards]

Thanks.

[polypolyman]

you're ruining the fork by using that wood... you need something made of rubber - slightly softer.

[DrDaveBilliards]

Thanks for the advice. I don't see any dings on my fork, and I thought wood wood be soft enough, but rubber would obviously be better.

Dr. Dave

[sidewallfusion]

vibration = resonance = sound = information = awareness.

Two tuning forks of the same frequency vibrate in sympathy, therefore information is passing between the two tuning forks.

Energy particles vibrate and spiral, they pass information to each other over vast distances. they resonate carrying information to the aware mind. The brain computes using nano tubules. Quantum interaction of energy arrising in thoughts and ideas.

Great video, peace and harmony.

[DrDaveBilliards]

Groovy!

[bonjour82]

Dr. Dave,

I'm wondering why the tips of the tines stop vibrating for a moment ( a really quick moment) and resume. Are the vibrational waves running up and down the tines and creating the pause at the tips? Or is the vibration equal throughout the tuning fork? Though I'm probably not even close to the answer. Would you be able to clarify? Thanks Dr. Dave :)

[bonjour82]

I apologize. I didn't quite understand "aliasing". I'm sure the explanation about aliasing answered my own question. Cheers!

[DrDaveBilliards]

Good job!

The camera lies if the frame rate isn't fast enough.

[diablocodyify]

thanks biggie dave

Y ou Y

[mistermuffin420]

fake

[DrDaveBilliards]

What do you think is fake ... and why?

I assure you everything in the video is real.

Dr. Dave

[mistermuffin420]

the so called "piano" was an elaborate myth created by the romans to gain power over the jew pilgrims in the 10th century BC.

what you prose in this obvious special effect saturated video is false.

[mistermuffin420]

*propose*

[DrDaveBilliards]

You obviously know a lot more than I do. I'm sorry to bother you with such an inferior video. :(

[cjracer1000]

lol THIS IS AWESOME!

[bigboy45454545]

Aliasing effect. Thanks for that. Now I can actually be a bigger nerd, and explain the effect, and what it's called. There's learning going on here. You don't get that from Facebook. I'm sending you a pinch.

Cheers.

[DrDaveBilliards]

You really are a nerd ... you publicly admitted learning something. :)

You're welcome.

[sntslilhlpr6601]

Cool stuff. Thanks for explaining the aliasing effect.

[DrDaveBilliards]

Thanks ... and you're welcome.

Dr. Dave

[signmypoodle]

that's not middle c. a above middle c is 440 hz

[DrDaveBilliards]

Thank you for clarifying.

[3piecesuits]

523.25 Hz is an octave above middle C.  Middle C for the A=440 Hz, equal tempered scale is 261.6 Hz.

[DrDaveBilliards]

Thank you for clarifying.

[Zingo33]

So how can we trust that the tuning fork is correctly tuned?

[mephistefales]

So if the fork is tuned to middle C, why does it make the piano resonate an octave higher than middle C?

[VanguardYears]

A perfect sine wave :)

Just out of curiousity, how much do these cameras cost in general?

[DrDaveBilliards]

I have camera supplier info under "See Also" at the website linked in the video description. The camera I use for the super-slow-motion stuff runs about $10,000-$15,000.

Dr. Dave

[Lonelyhowl]

That's not really happening? then my eyes are fucked!

[DrDaveBilliards]

Have you ever danced in a room with a strobe light. What you see isn't always exactly what is happening. The same thing is happening here. Because the camera is not taking pictures fast enough, what you see is not an accurate "picture" of what is happening.

Dr. Dave

[Lonelyhowl]

Wow thats amazing theres so much i don't know! Please make more videos like this

[DrDaveBilliards]

FYI, I have a lot more clips on the website linked in the video description.

Happy viewing,

Dr. Dave

[GreatestPotential]

You can tune a piano but can you tuna fish?

I just couldn't resist please forgive me