key equations to remember Flashcards
% Uncertainty for repeated measurements=
% Uncertainty = uncertainty/mean value *100
% uncertainty =
uncertainty/ value * 100
If measurements are repeated many times ( for instance repeated results for accurate answers) the uncertainty can be found by finding…
half the range of the measured values 1.32-1.22 = 0.10 uncertainty = +/_ 0.05
how do you find the total measurement and uncertainty of 2 or more measurements
- Find the uncertainties of all measurements( by halfing the lowest resolution of each measurements measuring tool if it’s a measurement )
- Add the measured readings/ measurements (volumes)
- Add together the uncertainties to get the combined uncertainty
- Combine step 2and 3 to give your answer
added reading±added uncertanties
percentage change
percentage change = (original val- new val/ original val) x100
(for a reading)percentage error=
(uncertainty/reading) x100
magnification=
image / actualsize
cardiac output=
stroke vol/heart rate
Calculation for how many chromosome combinations are possible during meiosis
(2^n)
Pulmonary ventilation rate =
Breathing rate x Tidal volume
Calculation for how many gamete combinations are possible during random fertilisation
(2^n x 2^n)
volume of cylinder
=π r² h
volume of a sphere =
V = 4/3 π r³
volume of a cone =
V = (1/3)π r²h
percentage uncertainty of repeated readings
100x (half the range/ mean value of results)
The uncertainty of a reading(what is a reading??) is± ?of the smallest scale reading.
The uncertainty of a measurement (what is a measurement??) is at least ±? of the smallest scale reading.
The uncertainty of a reading (one judgement) is ±0.5 of the smallest scale reading.
The uncertainty of a measurement (difference of 2 judgements) is ±1 of the smallest scale reading.
