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Question

The temperatures of two bodies measured by a thermometer are t1=20C±0.5C and t2=50C±0.5C. The temperature difference and the error therein is:
  1. 70C±0.5C
  2. 30C±1C
  3. 30C±0.5C
  4. 70C±1C


Solution

The correct option is B 30C±1C
Here,
t1=20C±0.5C
t2=50C±0.5C
The temperature difference of two bodies is
t=t2t1=50C20C=30C
The error in temperature difference is given by
Δt=(Δt1+Δt2)
=(0.5C+0.5C)=1C
The temperature difference is 30C±1C.

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