First slide

Accuracy; precision of instruments and errors in measurements

Question

The temperature of two bodies measured by a thermometer are $t_{1} = 20^{0} C + {0.5}^{0} C a n d t_{2} = 50^{0} C \pm 0.5^{0} C .$ The error in temperature difference is

Moderate

A

$\pm 1^{0} C$
B

$\pm 2^{0} C$
C

$\pm 3^{0} C$
D

$\pm 4^{0} C$

Solution

he temperature difference is given by $t' = t_{2} - t_{1} = (50^{0} C \pm {0.5}^{0} C) - (20^{0} C \pm {0.5}^{0} C)$
$t' = 30^{0} C \pm 1^{0} C$

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