The height of mercury column in a barometer provided with a brass scale
correct at 0oC is observed to be 75.2cm at 20oC. If αbrass = 18x10-6 oC-1
, the
true height of column at 20oC will be
a) 75.23cm. b) 75.24cm c) 75.25cm d) 75.26cm
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Answer is ( d ) it is the true height of column at 20°C
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