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1.Units, Dimensions and Measurement
easy
The temperatures of two bodies measured by a thermometer are $t_{1}=20^{\circ} C \pm 0.5^{\circ} C$ and $t_{2}=50^{\circ} C \pm 0.5^{\circ} C$ Calculate the temperature difference and the error theirin.
A
$70^{\circ} C \pm 1^{\circ} C$
B
$30^{\circ} C \pm 0^{\circ} C$
C
$30^{\circ} C \pm 0.5^{\circ} C$
D
$30^{\circ} C \pm 1^{\circ} C$
Solution
$t^{\prime}=t_{2}-t_{1}=\left(50^{\circ} C \pm 0.5^{\circ} C \right)-\left(20^{\circ} C \pm 0.5^{\circ} C \right)$
$t^{\prime}=30^{\circ} C \pm 1^{\circ} C$
Standard 11
Physics