username4063626
Badges: 14
Rep:
?
#1
Report Thread starter 2 years ago
#1
A scientist measured the size of each gill lamella of the gills of 40 damselfly larvae.

Mean width / mm (± uncertainty / mm) 1.61 (± 0.19)
Mean length / mm (± uncertainty / mm) 6.12 (± 0.41)

Calculate the mean surface area of one side of one gill lamella. Assume that a gill lamella is rectangular and give your answer to an appropriate number of significant figures.

Include the percentage error (uncertainty) of surface area in your answer. Show your working. [3 marks]


ive got the area (9.85mm^2) but i dont understand how to get the % uncertainty (the answer is 18.5-19)
1
reply
zstu
Badges: 1
Rep:
?
#2
Report 2 years ago
#2
bump
0
reply
TheYearNiner
Badges: 21
Rep:
?
#3
Report 2 years ago
#3
If like to know too bump
0
reply
maheenxox
Badges: 4
Rep:
?
#4
Report 2 years ago
#4
(uncertainty/value)*100 {You do this for both the width and the length then add them together
1
reply
zstu
Badges: 1
Rep:
?
#5
Report 2 years ago
#5
thanks
0
reply
username4063626
Badges: 14
Rep:
?
#6
Report Thread starter 2 years ago
#6
(Original post by maheenxox)
(uncertainty/value)*100 {You do this for both the width and the length then add them together
thanks
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Current uni students - are you thinking of dropping out of university?

Yes, I'm seriously considering dropping out (172)
14.68%
I'm not sure (54)
4.61%
No, I'm going to stick it out for now (344)
29.35%
I have already dropped out (35)
2.99%
I'm not a current university student (567)
48.38%

Watched Threads

View All
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise