- Messages
- 53

- Reaction score
- 5

- Points
- 8

- Thread starter arlery
- Start date

- Messages
- 53

- Reaction score
- 5

- Points
- 8

- Messages
- 211

- Reaction score
- 139

- Points
- 53

to add error bars to a point on a graph , simply take the uncertinaty range ( expressed as +/- its value ) and draw lines of a corresponding size above and below or on each side of the point depending on the axis to which the value corresponds

- Messages
- 53

- Reaction score
- 5

- Points
- 8

so if the uncertainities are of the values corresponding to y axis the error bars would be vertical??to add error bars to a point on a graph , simply take the uncertinaty range ( expressed as +/- its value ) and draw lines of a corresponding size above and below or on each side of the point depending on the axis to which the value corresponds

- Messages
- 211

- Reaction score
- 139

- Points
- 53

yupsso if the uncertainities are of the values corresponding to y axis the error bars would be vertical??

- Messages
- 1,477

- Reaction score
- 1,890

- Points
- 173

If the uncertainties are given for a quantity that is to be plotted on x-axis, error bars will be horizontal.so if the uncertainities are of the values corresponding to y axis the error bars would be vertical??

If the uncertainties are given for a quantity that is to be plotted on y-axis, error bars will be vertical.

part 2(e)(i)...in the mark scheme they're adding 1?!! aren't we supposed to add 1.6??!

- Messages
- 138

- Reaction score
- 13

- Points
- 28

q2 part d (i)

can anyone please tell me why have they multiplied intercept by 2??

- Messages
- 339

- Reaction score
- 105

- Points
- 53

Can anyone help me with hall probe?

How do we use it to measure the magnetic flux density?????

How do we use it to measure the magnetic flux density?????

or you could do it this way e.g R=1.7+/- 0.2 then uncertainty in logR would be (deltaR/R*In10)Assalamoalaikum wr wb!

wanna add this:

Finding uncerainty in log

say you are taking log of x...

now x is suppose.. 83 +/- 5...

log 83 = 1.92

so Upper Limit (UL) = 83 + 5 = 88

and lower limit (LL) = 83 - 5 = 78

~~find log of (UL-LL)/2 = (88-78)/2 = 5~~

~~log 5 = 0.70 => This is the uncertainty...~~

~~so log(83 +/- 5) = 1.92 +/- 0.70~~

Sorrydid a mistake in the metod I mentioned ealier...

this is how we proceed..

[log(UL) - log (LL)]/2

Check smzimran's post below..he has a different method...

this is the way we were taught...

Hope this helped..!

i asked my teacher da same ques n my teacher said dat v dont need to write about how hall probe works we jus gotta knw it is a device used to measure magnetic flux density n yu can draw a square shaped box showing it is a hallprob n connect it wit a voltmeter dats all i knw.Can anyone help me with hall probe?

How do we use it to measure the magnetic flux density?????

- Messages
- 438

- Reaction score
- 106

- Points
- 53

Can anyone help me with hall probe?

How do we use it to measure the magnetic flux density?????

- Messages
- 438

- Reaction score
- 106

- Points
- 53

- investigating the terminal velocity of a steel ball dropped in oil and it's relation to the radius
- determining the resistivity of glass
- determining the Young modulus of wood
- investigating the relation between the depth of a nail being hammered into wood and the speed with which it's hammered (jobless much?)
- determining the absorbtion coefficient of glass
- investigating the relation between the amplitude of a sound wave and the air pressure inside a double-glazed window
- investigating the relation between the resistance of an LDR with the distance from the light source
- investigating the relation the volume of air in a bottle and its resonant frequency
- investigating how the emf in a coil Y depends on the frequency of the current in coil X
- investigating the reltion between the strength of the magnetic field and the radius of the coil, using a hall probe

- Messages
- 506

- Reaction score
- 735

- Points
- 103

Came across an important note [atleast I am reading this for the first time], so wanted to share it with you all.

Rounding errors were also made. A number of candidates only used one decimal place for lg

^extract from June:2009 Examiner Report, Paper 5.

smzimran alphabravocharlie angelgirl:) Aqsa Mohd Mustehssun Iqbal hassam SkyPilotage

- Messages
- 1,477

- Reaction score
- 1,890

- Points
- 173

I always write the data to one better s.f than given !AsSalamoAlaikum Wr Wb!

Came across an important note [atleast I am reading this for the first time], so wanted to share it with you all.

Rounding errors were also made. A number of candidates only used one decimal place for lgd. It is expected that the number of significant figures in calculated quantities should be the same or one more that the number of significant figures in the raw data; however, in logarithmic quantities the number of significant figures is determined by the number of decimal places. In this question, sincedwas given to two significant figures, it was expected that lgdshould have been given to either 2 or 3 decimal places.

^extract from June:2009 Examiner Report, Paper 5.

smzimran alphabravocharlie angelgirl:) Aqsa Mohd Mustehssun Iqbal hassam

JazakAllah khair for reminding,

May Allah bless you!

Ameen

- Messages
- 506

- Reaction score
- 735

- Points
- 103

the point to note is...if it's log, then instead of sf, we go for the dp! like if it was 2sf in the raw data [note it was zero decimal places in that case], we put our data either 2I always write the data to one better s.f than given !

JazakAllah khair for reminding,

May Allah bless you!

Ameen

Aameen

wa eyyakum

may Allah bless u too..

- Messages
- 438

- Reaction score
- 106

- Points
- 53

- Messages
- 265

- Reaction score
- 89

- Points
- 28

Yes for logarithms, the number of s.f determine the number of d.p.the point to note is...if it's log, then instead of sf, we go for the dp! like if it was 2sf in the raw data [note it was zero decimal places in that case], we put our data either 2dpor 3dp(one better)

Aameen

wa eyyakum

may Allah bless u too..

If x = 5 s.f ( disregard d.p ) then log (x) --> 5 or 6 D.P!

Anyways thanks for noting and reminding others!

Jazak Allah

- Messages
- 506

- Reaction score
- 735

- Points
- 103

wa eyyakum..Yes for logarithms, the number of s.f determine the number of d.p.

If x = 5 s.f ( disregard d.p ) then log (x) --> 5 or 6 D.P!

Anyways thanks for noting and reminding others!

Jazak Allah

i didnt know this point before

- Messages
- 265

- Reaction score
- 89

- Points
- 28

Now you do alhamdulellah!wa eyyakum..

i didnt know this point before