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YOUR PARTICIPATION FOR THE GROWTH OF PHYSICS REFERENCE BLOG

Tuesday, February 18, 2020

A quantity y is to be determined from the equation shown. The percentage uncertainties in p, x and q are shown.


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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