A Level Physics ISA Help Part 3 – Percentage Uncertainties
[youtube http://www.youtube.com/watch?v=1dTn2pt5PuA&fs=1&rel=0]
The 3rd part in this series looks at an area many students find difficulty with, percentage uncertainties. How do you calculate them when taking measurements and repeat measurements? Watch…
0.2% is 1 significant figure. The 0 is a place holder and so does not count
as a significant figure.
Use the instrument precision
couldn’t u just times 0.2 by 3
thanks for sharing this so so so much, I’ve got ISA written task to do tmw:
)
The uncertainty in the first question is 0.005. The smallest division of
the voltage is 0.01, therefore you halve that which is 0.005. With the
number of likes and very little dislikes this video has, I’ll take it that
you misled a lot of people and they probably failed the question in the
exam. Decent video though.
this guy is bloody good
#physics #education #school #apphysics
You seemed to have solved my uncertainty ;)
A) the uncertainty is 0.005V. You are certain of 0.01V intervals, because
you can see it on the meter.
B) Why did you say to express percentage to 2.s.f and then give us a value
to 1.s.f? 0.01/4.68*100=0.21% (2.s.f)
Sort your shit out bro
thanks- I actually used this for as level chemistry
why is the number of sigfigs 2? Help ASAP plz
great video cheers mate .
when finding the mean and xing the values and dividing by 3 you would get
an uncertainty of +-0.03v?
Clearly explained and very helpful guide. Thank you.
DAN COTTLE YOU ARE A HERO!!! <3 if i pass my physics exam it's because of
you :D
What happens if you’ve taken multiple readings but there is no
spread/range?
If you have taken repeat readings how do you find the absolute uncertainty?
Thanks :)
i know if your writing the answer to 2sf then you put 2.21, but if you are
writing 0.2 to 2 sf then it would be 0.20, so dont “jeez” me dude ,
2:15 Wouldn’t the answer to 2 significant figures be 0.21%? because 0.2 is
only to 1 sig. fig.
obviously yes, but if your answer is 0.2, you write it 0.20 to 2sf to show
that there is no number folowing the 2.
okay i’m confused, so it doesn’t matter whether you put the uncertainty as
the smallest non-zero value of the measuring tool or half of it?
Give me strength… Let me introduce you to < This means that 0.25 isn't included in the range If I wanted to include 0.25 I would have put ≤ Idiot
Thanks man!!
Still not correct, if you have 0.2 by itself you can’t tell what it is to
2sf, it could be 0.15 ≤ x < 0.25.