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A steel metre scale is to be ruled so th...

A steel metre scale is to be ruled so that the millimetre intervals are accurate to within about `5 xx 10^(-5)`mm at a certain temperature. What is the maximum temperature variation allowable during the rulting ? Given `alpha` for steel `= 1.1 xx 10^(-5).^(@)C^(-1)`.

A

`8^@C`

B

`9^@C`

C

`4.5^@C`

D

`10^@C`

Text Solution

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The correct Answer is:
C
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