Question 23
A quantity y is
to be determined from the equation shown.
y = px / q2
The percentage
uncertainties in p, x and q are shown.
percentage uncertainty
p 6%
x 2%
q 4%
What is the percentage
uncertainty in y?
A 0.5 % B 1 %
C 16
% D 192
%
Reference: Past Exam Paper – June 2014 Paper 12 Q4
Solution:
Answer:
C.
y = px / q2
%Δy = %ΔP + %Δx + 2(%Δq)
%Δy = 6% + 2% +
2(4%) = 16%
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