Good video and very helpful - thanks. Small thing to mention (because it is important at A-Level) the calculated wavelength should only be reported to 2 s.f not 5 s.f. You can only be as accurate as the smallest number of s.f. used in the calculation.
Alfie agreed, but as I'm going on to use it in further calculation I wanted a few extra Sig Fig. Then I'd do my rounding at the end. But you are correct. The best skill is to use your calculator's memory to keep your calculated data ready for the next step! Thanks!
Just learnt about uncertainties - so would the uncertainty for your wavelengths be: 29.475 ± 7.29%. The speed of sound uncertainty would then be 368 ± 7.29%. or 368 ± 26.9. The method I did for uncertainty = mean± (range/2) The method I did for percentage uncertainty = uncertainty / mean *100 Is my method correct?
I am doing my physics practical with a similar set up but i am measuring the speed of sound in different temperatures do you have any advice on that? the videos really good!
Difficult one, I think you might be better off using an open ended tube method, as it may be easier to control air temperature in a smaller volume. Otherwise you may ahve to look at some natural variations like, time of day, windows open, or outside.
@@KitBetts-Masters Yes, i am using an open end tube, with a microphone in one side and speaker on other connected in a similar way to the CRO that you did. And i have a way of changing the temperature in the tube. Can you give me advice on how i can get a good approximation of the speed on different temperatures? Mainly how i get the speed from the CRO? Or you maybe have a guide i can use for the CRO? I would very much appreciate it! thanks
th-cam.com/video/C-t7B0kd6uU/w-d-xo.html In this video I talk through the fundamental frequencies of standing waves in pipes. You'd get frequency from oscilloscope and wavelength from the length of the pipe. 🙂🦍
@@KitBetts-Masters If i change the temperature, how would i calculate the new speed? Will the reading on the CRO change? Thanks, really appreciate your videos and advice!
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just I think as the sound is spreading out the signal attenuates. so the difference between high pressure peaks and low pressure troughs gets less. the sound is less loud further away basically.
so the numbers I'm recording are reach distance where it is in phase or pi out of phase. (in other words every half wavelength.) so I'm just finding the difference between two of them to give me the wavelength. i hope that makes sense?
Roxanne Foote pause the video at 7:02. then you'll see in first column i have number of wavelengths, ignore that. the second i have the raw measurements of these points on my ruler, each are a half wavelength apart. so third column, lambda in cm, is difference between every second reading, so 57.9 -28.0, then 72.1 - 45.5 and so on. these are a bunch of values for wavelength that I've averaged to use in my final calculation. i hope that's ok? have you tried this one for real?
+saad hassan Hiya, wavelength is measured on the wooden ruler on the side of the table. Taking measurements between points when sound is in phase with the signal.
Dan Deler it's a simple mono mic, and we have an oscilloscope lead which has two female 3mm pin ports. You could easily just cut the wire and solder it to an oscilloscope connector.
Thank you for your response, sir. But still I am having an issue with it, I really don't know how to connect it to the scope, I am trying though. Please if you can help in any way I will be pleased. Thank you.
gary's expression is one of apathy and indifference
Yeah, he doesn't really understand Physics all that well.
He thinks he does, but he doesn't.
@@KitBetts-Masters 😂😂😂
Plz do more core practicals...it's very helpful
This is on the exam tomorrow according to the advance info... here we go!
This guy is actually so cool.
Good video and very helpful - thanks. Small thing to mention (because it is important at A-Level) the calculated wavelength should only be reported to 2 s.f not 5 s.f. You can only be as accurate as the smallest number of s.f. used in the calculation.
Alfie agreed, but as I'm going on to use it in further calculation I wanted a few extra Sig Fig. Then I'd do my rounding at the end. But you are correct. The best skill is to use your calculator's memory to keep your calculated data ready for the next step! Thanks!
thank you very much! keep up with these informative videos. this will do so much good for me in my upcoming exam
puluglu yapışkanglu I'm really pleased! thanks for the comment! loads more videos to come!
This is brilliant. Thank you.
Thankyou! This was so helpful
Hi ,Can you tell me what is the Brand of the speakers you used in the video?
Just learnt about uncertainties - so would the uncertainty for your wavelengths be: 29.475 ± 7.29%.
The speed of sound uncertainty would then be 368 ± 7.29%. or 368 ± 26.9.
The method I did for uncertainty = mean± (range/2)
The method I did for percentage uncertainty = uncertainty / mean *100
Is my method correct?
Could u do another experiment with two microphones together?
Thanks a lot ❤
Are there any theoretical values or the only thing you can do is find the experimental values? I need the theoretical ones if there are any please.
I am doing my physics practical with a similar set up but i am measuring the speed of sound in different temperatures
do you have any advice on that?
the videos really good!
Difficult one, I think you might be better off using an open ended tube method, as it may be easier to control air temperature in a smaller volume. Otherwise you may ahve to look at some natural variations like, time of day, windows open, or outside.
@@KitBetts-Masters Yes, i am using an open end tube, with a microphone in one side and speaker on other connected in a similar way to the CRO that you did. And i have a way of changing the temperature in the tube. Can you give me advice on how i can get a good approximation of the speed on different temperatures? Mainly how i get the speed from the CRO? Or you maybe have a guide i can use for the CRO?
I would very much appreciate it! thanks
th-cam.com/video/C-t7B0kd6uU/w-d-xo.html
In this video I talk through the fundamental frequencies of standing waves in pipes. You'd get frequency from oscilloscope and wavelength from the length of the pipe. 🙂🦍
@@KitBetts-Masters If i change the temperature, how would i calculate the new speed?
Will the reading on the CRO change?
Thanks,
really appreciate your videos and advice!
@@lakshayveer4596 i need to ask as im doing the same experiment. How are you changing the tempertaure please?
May i know how did you calculate the individual lambda values from the distance (x) values? Thank you. :)
Each point I record is either in phase or in antiphase. So lambda is the distance between two of them. 🦍
@@KitBetts-Masters thanks alot :)
thank you sooo sooo soooo sooo much!!!!!❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤
Gayy
Grab my new book to help you get ready for studying A Level Physics and to prepare for the exams:
amzn.to/3c6H9O0 Paperback or Kindle: amzn.to/2Tf57Ot
You can read ”Prepare for the Challenge of A Level Physics” for free with a free trial of Kindle Unlimited: www.amazon.co.uk/kindle-dbs/hz/signup?tag=gorillaphys06-21
why there is an apparent change in the amplitude when you move the microphone back and fro?
just I think as the sound is spreading out the signal attenuates. so the difference between high pressure peaks and low pressure troughs gets less. the sound is less loud further away basically.
How would repeating the experiment at different frequencies improve the accuracy?
Hello, there's going to be a random error due to measurements of length and frequency, so more repeats, eliminate anomalies and average will help!
I dont understand how you found the frequency just by looking at the oscilloscope. Could you please explain it me?
Sure can! th-cam.com/video/ply0RA5HDLA/w-d-xo.html
safety precautions?
No significant risks really. You could wear ear protection if you were to go above 95dB. And you are using mains electricity, so PAT testing annually.
how did you calculate the wavelengths in the table. i can't seem to get the same answers
so the numbers I'm recording are reach distance where it is in phase or pi out of phase. (in other words every half wavelength.) so I'm just finding the difference between two of them to give me the wavelength. i hope that makes sense?
GorillaPhysics im talking about the lambda/cm. i can't figure out how you calculated it
Roxanne Foote pause the video at 7:02. then you'll see in first column i have number of wavelengths, ignore that. the second i have the raw measurements of these points on my ruler, each are a half wavelength apart. so third column, lambda in cm, is difference between every second reading, so 57.9 -28.0, then 72.1 - 45.5 and so on. these are a bunch of values for wavelength that I've averaged to use in my final calculation. i hope that's ok? have you tried this one for real?
i haven't tired it. I'm doing a planning and designing lab using your method. I think understand now thanks
Ok cool, stop by and let me know how it went, (and if you got closer to the accepted value of speed of sound!)
Sir, how did you get the wavelength values from the distance values?
They are all half wavelengths apart, so distance between two is a wavelength. :-)
@@KitBetts-Masters Thankyou so much Sir.. I got it..
Thanksss
What’s interfering with what please explain
Unique Astra no interference, it's just two signals. One from the mic, one from the signal generator.
how did you calculate the wavelength?
+saad hassan Hiya, wavelength is measured on the wooden ruler on the side of the table. Taking measurements between points when sound is in phase with the signal.
+GorillaPhysics thanks
@@KitBetts-MastersPhysics is this similar to the way you get wavelength from a standing wave?
Sir, please tell me how you connected the mic to your scope?
Dan Deler it's a simple mono mic, and we have an oscilloscope lead which has two female 3mm pin ports. You could easily just cut the wire and solder it to an oscilloscope connector.
Thank you for your response, sir.
But still I am having an issue with it, I really don't know how to connect it to the scope, I am trying though. Please if you can help in any way I will be pleased.
Thank you.
what frequency is the signal generator set to?
Can't remember exactly, 4k?
Nope, at 8:45 ish, 1250Hz. You just need a frequency that gives a wavelength you can measure accurately.
@@KitBetts-Masters thank you.
How do u change the frequency
B9 7 just in the signal generator. 🦍
can anyone explain the calculations he did to find the wavelength . Nevermind I see he answered this a few times lmao
Lols. 🙂🦍