A steel tape measures the length of a copper rod as 90. 0 cm when both are at 10°C, the calibration temperature for the tape. What would be the tape reading for the length of the rod when both are at 30 °C. Given, a for steel 1.2 x 10 -5 °C -1 and a for copper is 1.7 x 10 -5 °C -1 .
Text Solution
Verified by ExpertsThe correct answer is:
A
90. 01 cm
As the steel tape is calibrated at 10 ° C, therefore, adjacent centimeter marks on the steel tape will be separated by a distance of
Length of copper rod at 30 °C
= 90(l + 
c 20)cm
Therefore, number of centimeters read on the tape will be
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