HOW WAS PHY P33?????

[ashhadazam]

Well uncertainty is actually :

Smallest division on the instrument u r using/ur reading .. !!

Most watches have divisions of 0.1 but in digital it is 0.01... So all of u r correct.. it isnt something that u always have to take the same value!

 

[ajmaeen]

lol........... p4 acha kr lo ..... A cnfirm aye ga

 

[ashhadazam]

we r AS students .. atleast me

 

[MAVtKnmJ]

For such questions you can use any value from 0.1-0.4 seconds, although most preferable is 0.2

 

[ajmaeen]

ooo...... ok....... then it does matter...... im givingall the pprs... so p4 it is.....

 

[ajmaeen]

@MAVtk........ yes i thought the same thing.... did 0.2

 

[umer khan]

i dnt think i did my question 1 as gud as 2 ............. the pwr supply was so strange it was giving 0.44V at 12V .............. wha abt urs guys ............. my graph only had two point on the line with 2 above and below it.............. do u think i would lose a mark for accuracy of data ?

 

[maximum_user]

no ur all wrong!!!
uncertainity is absolute error divided by two ...or in simpler words smallest division divided by two..so like this the answer was 0.3%...n it is confirmed!!!

 

[ajmaeen]

i think thats %error of the of the device........ i think the error here wud hav been human reaction......... but u may be right. :/

 

[umer khan]

i think thats %error of the of the device........ i think the error here wud hav been human reaction......... but u may be right. :/

actually u had to use the human reaction error time any frm the range 0.1-0.3

 

[xarak]

lol...my gradient wuz compplleettlly retarted....it wuz 8.6 x 10^-16 nd y intercept wuz positive!!rest all paper wuz gewd!!nd wt were we suppose to rite for the justify the number of significant figures for k??

 

[intel1993]

i wrote 2 significant.....as my raw data was presented in 2 significant... it depends upon u the significant of ur raw data...

 

[kugs]

my gradient was 0.7, y-intercept was 0.03. Is it correct? Also was the value of k constant?

 

[faheem92]

To all those people who took 0.1s as their absolute uncertainty, have you ever bothered to read examiner reports or marking schemes related to these type of questions?

 

[mzzzz]

i guess we take 0.1 to 0.4s as human reaction error

kher i didnt appear fr p33

 

[umer khan]

lol...my gradient wuz compplleettlly retarted....it wuz 8.6 x 10^-16 nd y intercept wuz positive!!rest all paper wuz gewd!!nd wt were we suppose to rite for the justify the number of significant figures for k??

mine y-intercept was also positive ...... but my gradiant was even crazier 232.???

 

[Aamir Khan]

haha yeah faheem is right to find percentage uncertainty..take two readings..take their average..and find the difference between one of the readings and the average reading...difference/average reading x 100..this is the best method..other methods are also correct..we had to see human reaction time..which had to be at least .1 or .2

 

[Aamir Khan]

and my gradient was 1.25 and y intercept was -.0175

 

[zwitterion]

was it necessary to convert the current reading from milliampere to ampere??.......... i did all my calculation in mA.......... so got the grad 730mA/V^10............................... that makes it .73 in Ampere................. and i got the y intercept exactly 0................

Yeah my gradient was around 548. And my y-intercept was -1.34. The conversion was not mentioned so i think it would be okay to not have converted it.

 

[Aamir Khan]

it had to be converted..our examiner specifically told us not to forget to convert it...nice guy