Question

Calculate the temperature difference and the error in calculation if the two temperatures are given as $T_1=20℃Â\pm 0.5℃$ and $T_2=50℃Â\pm 0.5℃$ .

• A. $30℃Â\pm 1℃$
• B. $70℃Â\pm 0.5℃$
• C. $30℃Â\pm 0.5℃$
• D. $70℃Â\pm 1℃$

Answer 1

Answer: (A)

Here, $t_1−20℃Â\pm 0.5℃;t_2=50℃Â\pm 0.5℃$
The temperature difference of two bodies is
$t=t_1−t_1=50℃−20℃=30℃$
The error in temperature difference is given by
$Δt=\left(Δt_1+Δt_2\right)=\left(0.5℃+0.5℃\right)=1℃$
The temperature difference is $30℃Â\pm 1℃$ .