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Question

A brass scale correctly calibrated at 15C is employed to measure a length at a temperature of 35. If the scale measures a reading of 75cm(αbrass=2×105/C)

A
74 cm
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B
76 cm
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C
78 cm
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D
75.03 cm
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Solution

The correct option is B 74 cm
Given: Δt=1030=20oC,P1=75cm

Solution:
P2=P1[1+(γHgα)Δt] = 75[1+(17520)×106×(20)]74


Hence A is the correct option

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