Video Gallery

Period and frequency of a tuning fork lab

Go to Video Gallery Added May 06, 2014 •

Copy this URL:
Embed code:	<iframe class="edlio-embed-player" type="text/html" width="640" height="360" src="//www.pointlomahigh.com/apps/embed/?v=54144" frameborder="0" allowfullscreen></iframe> Change dimensions

Go HD

Use data collection sheet to accompany lab

Show Transcript

this is the period and frequency of a tuning fork lab beginning question how are the period for a wave in the frequency related that's something we've already studied in Master should be an answer that so we're going to open logger pro on the computer that should open to a sound level versus time graph so I've opened it up it says sound level verse I'm here I've got a microphone hooked up and if I do something in the microphone you see a picks up the sounds that are happening you see that a voice is a very mix sound what something like a whistle  smart set sound wave so what we're going to use as we're going to be as in tuning Forks today to create Soundwave so let's see what we're supposed to do  strike a tuning fork with a rubber mallet so it makes the sound push the collect button hold the tuning fork at the end of the microphone when the waveform is nice and smooth clickstop so let's get it here or maybe see the waveform Okay so  strike the tuning car then you can see away patterns appearing there Peaks referring to compressions and then those are your crusts and then your bottom part your troughs would be like rarefactions in there so looks pretty smooth what I'm going to want to do is Strike this and stop it while it's running  I want to freeze that pattern of waves okay there's a pretty smooth wave pattern  Nexus S sketch the save as it appears so we would sketch a wave that's going up and down from an amplitude kind of weird that it's not centered but that's okay we can figure that out so next would be using the x equals button  so let's see using the x equals button find the time at the speak where the first Crest so this is our first Crestor Peak right here x equals button is right there and this gives me a time of .001 seconds for that purse Peak so find the time at the first Crestor Peak this one for us would be .001 seconds then I'll count over 5 crests and find the time for that Crest make sure the crest you start with a zero not one so this one's one two three four and five the top of this one is .011 seconds back to pick there okay .011 so now I'm step 8 Mark the time for that Crest so that would be 0.01 okay the speed of the wave is the amount of waves per second  use the information from 7 and 8 to find the period of the wave in the space lower show the equation first find the basic. Equation on your equation sheet and substitute in the measurements for the variable okay sets take a look at cheat  word Crush free three of the Raven sheet now and it looks like..... There's our basic. One. Equals time divided by number of things so  content  so looks like we need a time and a number things will the time is going to be what we play some track those two so the time is 0.011 - 0.001 which would be zero point 010 seconds so there's our time and that was counted over five cressets five waves there's our number things so t for us is going to be that 0.010 divided by 5 Minnesota seconds is answer so I need a calculator to go ahead and do that  okay you get your answer here  I must go to the back page the frequency of a wave tells us how many Waves per second this hurts that is the reciprocal the. Using the answer to step 9 determine the experimental value for the frequency in the space below show the home first and then substitute in the measurement for the variables so the equation is frequency equals one over. The period is equal to play seconds he found on the other side so then you'll one over  the period from the other side and then your answer will be in hertz  that would be two unit down there where since unit what is the frequency The Tuning Fork labeled on the 24th so where's that tuning fork I was using headers  so is this one and it says 500c yes I mean cycles per second that's hurts 500 hurts so it was a 500 Hertz tuning fork hopefully we get to close to that when we do this up here  and then we can answer number 11 or 12 to see if they're the same number 13 repeats for another tuning-fork record data below you no need to show work on this step just follow step 7-Eleven described with the new tuning fork what's your new one second one is going to be 8000 hurts so let's see what that looks like and we go and try to get a wave pattern so there's the wave pattern Sanskrit collect BCS time went by it got smaller and smaller play that's the amplitude going down that's the loudness of the sound so looks like we got a pretty smooth wait for him here  now just like before I'm going to get the sine of x equals get the time at the first in the can over 1 2 3 4 5 equal time at the 5th and then we'll do manipulation with those so the time at the first  so my two times El Con 182  those were 0.001 second and 0.006 seconds so my time when I get when I subtract those that's 0.006 - 0.001 that's going to be 0.00 5 Seconds it took for those five wigs  so the number of things was 5 waves so now to find. It's Time to vided by number of things so that's going to be 0.005 we get to  you will get an amount of seconds here when you divide those and that's what your up here on the slide and then to find the frequency frequency is going over the. So your answer from up here go down here it'll be per second which will be Hertz in you'll get an answer and hopefully it's something close to that the actual frequency was thousand  Hertz and then hopefully the frequency we get by analyzing the the . and then using have to find frequency lines are being what with the tuning fork is 7 way of a follow-up question you determine the frequency of a sound wave if the time at the first is .525 seconds and it XI crest of these are 10 fits 10 waves is .554 seconds are we going to do the same process up here find your times and your number away is instead of being 5 on this one is going to be 10 and then you'll find. And then you can find Fancy by  the reciprocal so good luck with finishing up this lab

Uploaded by Brian Benz.

Video Gallery

Period and frequency of a tuning fork lab

Popular Videos