Question

The length of a metal rod at 20 degree Celsius is 1 m when the temperature is increased to 50 degree Celsius the expansion is 1 mm.If the length is to be decreased by 1 mm ,the temperature to which it should be cooled is
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Answer 1

Answer:

-100c

Explanation:

Correct option is C)

l1l2−l1=α(50−20)

11×10−3=α(30)

α=3.34×10−5/0c

1−1×10−3=α(T−20)

T=(−30+20)=−100c

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