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A Student's Guide to Data and Error Analysis

Herman J. C. Berendsen

Chapter 2

The presentation of physical quantities with their inaccuracies - all with Video Answers

Educators


Chapter Questions

03:45

Problem 1

Correct the following notations:
(a) $l=3128 \pm 20 \mathrm{~cm}$,
(b) $c=0.01532 \mathrm{~mol} / \mathrm{L} \pm 0.1 \mathrm{mmol} / \mathrm{L}$
(c) $\kappa=2.52 \times 10^2 \mathrm{Am}^{-2} / \mathrm{V} \mathrm{m}^{-1}$,
(e) $g=2 \pm 0.03$.

Kim Trang Nguyen
Kim Trang Nguyen
Numerade Educator
11:42

Problem 2

Convert the following quantities to SI units or units allowed within the SI system (see data sheet UNITS on page 215 ):
(a) a pressure of 1.30 mm Hg ,
(b) a pressure of 33.5 psi ,
(c) a concentration of 2.3 mM (millimolar),
(d) an interatomic distance of $1.45 \AA$,
(e) an activation energy of $5.73 \mathrm{kcal} / \mathrm{mol}$,
(f) a daily energy requirement of 2000 calories,
(g) a force of 125 lbf ,
(h) an (absorbed) radiation dose of 20 mrad ,
(i) a fuel consumption of 3.4 (US) gallon per 100 mile,
(j) a dipole moment of 1.85 debye,
(k) a polarizability of $1.440 \AA^3$. Note that polarizability $\alpha$ in rationalized SI units is the ratio of induced dipole moment (in Cm ) and electric field (in $\mathrm{V} / \mathrm{m}$ ). In unrationalized units the polarizability is $\alpha^{\prime}=\alpha /\left(4 \pi \varepsilon_0\right)$, expressed in units of volume.

Lori Mccoy
Lori Mccoy
Numerade Educator