Question

10. The temperature of two bodies are measured as
(20°C $ 0.5°C) and (40°C + 0.4°C). The
temperature difference of two bodies with error
limits, is
(1) (20 0.1)°C (2) (20 0.9)°C
(3) (20 + 2.0)°C (4) (20 + 0.0)°C​

Answer 1

Answer:

(2) 20°C ± 0.9°C

Explanation:

When two quantities having errors are added or subtracted , the errors are always added up.

Here the difference between the temperatures is

40 - 20 = 20°C

But since the errors are added up ,

0.5 + 0.4 = 0.9°C

Therefore the answer is represented as :

20°C ± 0.9°C

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