PHYSICS 9702 P3 help!!!

[SciGen]

hey guyx,
how do we calculate the limit of experimental accuracy for k values in Q2....as examiner reports frequently have stated that we have to set up the limits accordin the % uncertaintiy we have calculated in the previous parts....
plz help ...thnx in adv....

 

[Skhan94]

This thing confuses me also......but i guess the two value of k must be within 20% for the relationship to be directly Propotional...!!

 

[SciGen]

Do we need to take several readings and then take average for a single set of reading in Q2?

 

[doc.ahmed]

the ting is if they are less then equal to 20% your result shows that equ. is been followed else nt but one thing they are always following up till today dont know bout tomorrow.

 

[Maximus75970]

calculate 2 values of k from the 2 measurements. substract the larger value from the smaller value n divide by larger value n multiply by 100

 

[SciGen]

calculate 2 values of k from the 2 measurements. substract the larger value from the smaller value n divide by larger value n multiply by 100

but whats is the limit of the experimental accuracy?

 

[Skhan94]

Do we need to take several readings and then take average for a single set of reading in Q2?

It better to take 2 Readings only....Because then you can write -> "2 readings are not enough to draw conclusion" in Limitations

 

[Slipknot.2]

10 - 20% then it is directly propostional.

 

[Umar Farooq]

this formula is usefull k1-k2/k1X 100%
if the percentage is greater than 20 % then both k are correct and equation is also correct.
Keeping in mind that k1 is bigger

 

[Maximus75970]

but whats is the limit of the experimental accuracy?

its strictly 10 %. if greater then wrtie suggestion doesnot support its propotional

 

[Maximus75970]

any leaks what is coming people???

 

[mujtabashahnawaz]

this formula is usefull k1-k2/k1X 100%
if the percentage is greater than 20 % then both k are correct and equation is also correct.
Keeping in mind that k1 is bigger

No dude u are wrong, if %age is within 20% then the eq is correct

 

[Aarjit]

but whats is the limit of the experimental accuracy?

There can be two possible limits for the accuracy of imperial values. Let us suppose an arbitrary variable 'k';

[1] lim (% uncertainty in k) = k1+k2+k3+...+kn * 100% [for comparison with k's individual uncertainty]
pretty clever, eh?.............................k(mean)

[2] 20% standard uncertainty

if % uncertainty in k < k's individual uncertainty OR % uncertainty in k < 20%, then the suggested relationship is VALID.

 

[SciGen]

but yar examiners say this,
k every student need to give his own experimental limits according to the calculated % uncertainty value...if student hasnt done this,then examiner states tht he considers 20%...whats all this yar!

 

[SciGen]

There can be two possible limits for accuracy of imperial values. Let us suppose an arbitrary variable 'k';

[1] lim (% uncertainty in k) = k1+k2+k3+...+kn * 100% [for comparison with k's individual uncertainty]
pretty clever, eh?.............................k(mean)

[2] 20% standard uncertainty

if % uncertainty in k < k's individual uncertainty OR % uncertainty in k < 20%, then the suggested relationship is VALID.

hey can u please explain the first method.......

 

[mujtabashahnawaz]

but yar examiners say this,
k every student need to give his own experimental limits according to the calculated % uncertainty value...if student hasnt done this,then examiner states tht he considers 20%...whats all this yar!

In which report, it is written, can u send a link?

 

[aom]

I don't understand the 20% thing???!!! Please explain

 

[Aarjit]

but yar examiners say this,
k every student need to give his own experimental limits according to the calculated % uncertainty value...if student hasnt done this,then examiner states tht he considers 20%...whats all this yar!

Exactly!

You need to compare your uncertainty in the two (or more) values of k with EITHER the individual % uncertainty of k OR simply compare it with the standard acceptable uncertainty of 20%; albeit, you will have to mention the latter in your answer. The examiner can't just 'consider' that you've done this in your head.

 

[SciGen]

Exactly!

You need to compare your uncertainty in the two (or more) values of k with EITHER the individual % uncertainty of k OR simply compare it with the standard acceptable uncertainty of 20%; albeit, you will have to mention the latter in your answer. The examiner can't just 'consider' that you've done this in your head.

but bro how to calculate individual % uncertainty in K? and then how to compare?

 

[aom]

For example if i have K1= 0.276 and K2=0.319 is it directly proportional or not. Please with a step by step explaination .. THANK YOU