IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => GCE AS & A2 Level => Queries => Topic started by: hafza89 on June 03, 2009, 02:27:50 pm

Title: percentage uncertainity
Post by: hafza89 on June 03, 2009, 02:27:50 pm
guys how do we calculate uncertainities and percentage uncertainities
Title: Re: percentage uncertainity
Post by: Blue_Ice on June 03, 2009, 02:36:32 pm
% uncertainty= actual(absolute)uncertainty/ true value

and when u r doing an experiment and u want to find the absolute uncertainty, repeat a certain measurement twice, then

absolute uncertainty= 1/2 (range)

the range is the difference between the two mesurements

Title: Re: percentage uncertainity
Post by: phoolan_rani on June 03, 2009, 02:45:43 pm
then we no need to see smallest division on d ruler or any equipment....
Title: Re: percentage uncertainity
Post by: Blue_Ice on June 03, 2009, 02:50:31 pm
u can do tht too  :D

absolute uncertainty= smallest division/ true value

both r correct  ;)
Title: Re: percentage uncertainity
Post by: barca fever on June 03, 2009, 03:15:10 pm
Quote from: Blue_Ice on June 03, 2009, 02:36:32 pm
and when u r doing an experiment and u want to find the absolute uncertainty, repeat a certain measurement twice, then
absolute uncertainty= 1/2 (range)
the range is the difference between the two mesurements

explain absolute uncertainity.......o.5 [range]
i dont get it
Title: Re: percentage uncertainity
Post by: Blue_Ice on June 03, 2009, 03:17:10 pm
Quote from: barca fever on June 03, 2009, 03:15:10 pm
Quote from: Blue_Ice on June 03, 2009, 02:36:32 pm
and when u r doing an experiment and u want to find the absolute uncertainty, repeat a certain measurement twice, then
absolute uncertainty= 1/2 (range)
the range is the difference between the two mesurements

explain absolute uncertainity.......o.5 [range]
i dont get it

u repeat the reading twice, then subtract the two readings (thts the range), then divide by two to get the absolute uncertainty
Title: Re: percentage uncertainity
Post by: barca fever on June 03, 2009, 03:20:18 pm
Quote from: Blue_Ice on June 03, 2009, 03:17:10 pm
Quote from: barca fever on June 03, 2009, 03:15:10 pm
Quote from: Blue_Ice on June 03, 2009, 02:36:32 pm
and when u r doing an experiment and u want to find the absolute uncertainty, repeat a certain measurement twice, then
absolute uncertainty= 1/2 (range)
the range is the difference between the two mesurements

explain absolute uncertainity.......o.5 [range]
i dont get it

u repeat the reading twice, then subtract the two readings (thts the range), then divide by two to get the absolute uncertainty
Thanks alot........................................................
Title: Re: percentage uncertainity
Post by: Blue_Ice on June 03, 2009, 03:21:01 pm
welx  :)