A steel tape gives correct measurement at 20^o C . A piece of wood is being measured with steel tape

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10-1.Thermometry, Thermal Expansion and Calorimetry

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A steel tape gives correct measurement at $20^o C$. A piece of wood is being measured with the steel tape at $0^o C$. The reading is $25 \,\,cm$ on the tape, the real length of the given piece of wood must be:

A

$25\,\, cm$

B

$<25\,\, cm$

C

$>25\,\, cm$

D

can not say

Solution

since temperature is decreased, length of the steel tape will decrease.

So whatever we will measure will show more than the a actual length.

So the real length of wood must be less than $25 \mathrm{cm}$

Answer $B:$

Standard 11

Physics

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