Thanks for the video, but I got confused at 00:52 "Both of the uncertainties in a measurement must be taken into account; the uncertainty of the zero marker and the uncertainty of the measurement point. Example: Burettes and rulers Both the starting point and the end point of the measurement must be judged. This leads to two uncertainties overall, making it a measurement. Both ends of the ruler have a ±0.5 scale division uncertainty, therefore the measurement will have an overall uncertainty of ±1 division. For most rulers, the uncertainty in a measurement of length will be ±1 mm." - physicsandmathstutor The syringe examples makes sense because in the first case you only one judgement is made and in the second case two judgements are made. But in both cases for the ruler, two judgements are made.
Hi, in A level, we consider no judgment needed when u are measuring by using a 0 of ruler as a starting point. As it's the end of the measuring instrument. But of course, some might consider a judgement is needed there as long as the 0 is not exactly the end of the ruler, hence two errors are considered. "Similarly, if using a ruler then there would be an error at each end unless you start at 0" - learner guide for Cambridge international AS/A level biology 9700
@@DBiologyClassroom YOU LITERALLY SAVED MY GRADE SIR!! AAAA!! MY PAPER WENT EXTREMELY WELL, AND IT COULDN'T HAVE BEEN POSSIBLE WITHOUT YOUR HELP!!!! THANK YOU!!! THANK YOU!!! THANK YOUU!!!!😭😭💛💛💛
Hi, thank you very much! May I ask a quick question regarding degree of uncertainty? In 32/M/J/12 Q1 aiv), they asked about the degree of uncertainty for a ruler which goes from 0 to 2cm with 1mm divisions... and their calculation was 0.5mm x 2 = 1mm, with the answer being +/- 1mm. Why did we have to multiply by 2 here? Sorry for the trouble and thank you once again for the vid
Hi, in the old papers, they consider that as long as the ruler has a gap between zero and the end, error applies at both ends. But in the 2016 learner's guide, it is stated that "if using a ruler then there would be an error at each end unless you start at 0". So I think it is safer to follow the latest statement.
for 0.5/34 x 100%, i tried it on the calculator and got 0.0147, i was just wondering if that meant x 100 and not 100 percent.... I'm still so confused. I have a lab report due and I had no idea how to calculate any of this, thank you for this video it helped me a lot!!
This made my entire biology assignment so much easier. Thank you!
You are welcome :)
This video is super underrated:(
BEST BIOLOGY PAPER 3 VIDEO EVER
Thank you so much :) help me to share it ! =D
Watched every practical video, amazing!! thank you so much and keep doing what you are!!!
Thanks ! :)
Why did I just find you an hour before the exam 😂😂
All the best !!!
David de lecturer thanks (:
😂😂😂😂Me too 4 yrs after
@@faithzoey6659 good luck 😂😂😂
does the not counting error when starting from 0 stuff apply for the 2024 syllabus as well?
it honestly just depends on where you decide to start measuring from
Hi, yes it does
Thank you for the clear explanations and examples!
you are welcome !
Thanks for the video, but I got confused at 00:52
"Both of the uncertainties in a measurement must be taken into account; the uncertainty of the zero marker and the uncertainty of the measurement point. Example: Burettes and rulers Both the starting point and the end point of the measurement must be judged. This leads to two uncertainties overall, making it a measurement. Both ends of the ruler have a ±0.5 scale division uncertainty, therefore the measurement will have an overall uncertainty of ±1 division. For most rulers, the uncertainty in a measurement of length will be ±1 mm."
- physicsandmathstutor
The syringe examples makes sense because in the first case you only one judgement is made and in the second case two judgements are made. But in both cases for the ruler, two judgements are made.
Hi, in A level, we consider no judgment needed when u are measuring by using a 0 of ruler as a starting point. As it's the end of the measuring instrument. But of course, some might consider a judgement is needed there as long as the 0 is not exactly the end of the ruler, hence two errors are considered.
"Similarly, if using a ruler then there would be an error at each end unless you start at 0" - learner guide for Cambridge international AS/A level biology 9700
@@DBiologyClassroom
Thanks
@@AbdelrahmanOsama No problem at all
I LOVE YOU THANKS FOR SAVING MY LIFE!!!!!
You are welcome !!
Super clear explanation, thank you!
you are welcome!
at 0;25 why was the smallest divison 1mm? Im a bit confused on where ur getting these numbers from?
Hi, that is the measurement of the smallest division on the ruler. Each of the division is 1mm.
beautifully explained! thanku sir!
Most welcome!
YOU`RE AWESOME!! 🙌🙌
Thank you 🙏🏻🙏🏻🙏🏻
@@DBiologyClassroom YOU LITERALLY SAVED MY GRADE SIR!! AAAA!! MY PAPER WENT EXTREMELY WELL, AND IT COULDN'T HAVE BEEN POSSIBLE WITHOUT YOUR HELP!!!! THANK YOU!!! THANK YOU!!! THANK YOUU!!!!😭😭💛💛💛
@@DBiologyClassroom MAY GOD BLESS YOU SIR! YOU`RE AMAZING!!!🙏😭😭💛
@@nabihaamir8453 you are welcome! God bless you too.
Hi, thank you very much! May I ask a quick question regarding degree of uncertainty? In 32/M/J/12 Q1 aiv), they asked about the degree of uncertainty for a ruler which goes from 0 to 2cm with 1mm divisions... and their calculation was 0.5mm x 2 = 1mm, with the answer being +/- 1mm. Why did we have to multiply by 2 here? Sorry for the trouble and thank you once again for the vid
Hi, in the old papers, they consider that as long as the ruler has a gap between zero and the end, error applies at both ends. But in the 2016 learner's guide, it is stated that "if using a ruler then there would be an error at each end unless you start at 0". So I think it is safer to follow the latest statement.
@@DBiologyClassroom Hi I see! Thank you very much for the help 😊
@@chewjayren3129 you are welcome
Thank you so much.Awesome.
You are welcome
Thank you so much
You are welcome !
This is pretty good, thank you😊
you are welcome !
Will you post other videos on As practical ?
Hi the next few will be on A2
for 0.5/34 x 100%, i tried it on the calculator and got 0.0147, i was just wondering if that meant x 100 and not 100 percent.... I'm still so confused. I have a lab report due and I had no idea how to calculate any of this, thank you for this video it helped me a lot!!
hi, yes, just x100 to change it into %
@@DBiologyClassroom thank youuuuu!!!
@@kuroomeow you are welcome!
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Thanks for your support!
❤thank you
You are welcome 😁