Paper 3 Practical Skills (IAL Paper 6)
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- เผยแพร่เมื่อ 13 ก.ย. 2024
- In preparation for Paper 3 for home A-level or Paper 3 or 6 for IAL...
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just in time! love to see it, we appreciate your work alot, thanks for everything.
You’re most welcome! The very best of luck to you.
Yes just in time! Physics paper 3 on Thursday
Sooo helpful! Thank you for the video
Great Video!
Can we get a face reveal pls 😩
thank u so much for this video!! If they give you the uncertainty of the instrument in the exam like +/- 0.1mm, do you use that to calculate the percentage uncertainty as the numerator, or do you use half that value? Thanks in advance.
If you are sure that’s the uncertainty (which would be weird since that would imply a resolution of 2mm), use that. But if that’s the resolution of the instrument, based on what instrument they say is being used (in this case a metre rule) then use half that. They expect you to know the resolution of the 4 instruments I listed.
@@nutshellphy thanks so much. I was just confused, because in the 2017 Edexcel a level paper, question 6, they give 0.27mm +/- 0.01mm for the diameter and 1.25m +/- 0.05m for the length, and in calculating the percentage uncertainties I halved 0.01, and 0.05, whereas they didn't, because that's the uncertainty, not the resolution?
Ah! That’s because 2017 is still using the old ways… now it’s definitely half resolution.
@@nutshellphy ahhhhh, okay!! Thanks!! I have been confused for days 🤣🤣🤣🤣
when do i divide the least count by 2? and when do i use the given value when trying to calculate uncertainty
There are various ways of determining uncertainty. Edexcel have plumped for this one. You can also do ‘furthest from the mean’ if you want.
I’m not sure what you mean by ‘given value’ though.
why do some people take full resolution as uncertainty but some take half i’m always confused about that. do we always take half or are their some special cases where we must take full resolution
for example in oct 21 4bi to find %U they take half the resolution and in june 2018 1ai they take full resolution to find %U, both are similar questions of explaining why micrometer screw gauge is an appropriate instrument
Often it depends on whether it’s the new spec or the old. 2018 might still be old spec (if you’re taking about IAL). The new spec says half. The exception is if you’re not measuring from zero, like across multiple wavelengths along a metre rule where you have to take 2 readings from the rule. Then it’s half at each end.
I suspect your example is a situation where full res was still accepted until people adapted. Now it has to be half.
@@nutshellphy yes IAL, thank you so much you've seriously helped me out a lot in these past few months with your videos
You’re most welcome! Glad they’ve been helpful.