A metallic tape gives correct value at 25^{circ} C . A piece of wood is being measured by this metal

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10-1.Thermometry, Thermal Expansion and Calorimetry

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A metallic tape gives correct value at $25^{\circ} C$. A piece of wood is being measured by this metallic tape at $10^{\circ} C$. The reading is $30 \,cm$ on the tape, the real length of wooden piece must be .......... $cm$

A

$30$

B

$>30$

C

$<30$

D

Data is not sufficient

Solution

(c)

At lesser temperature tape will decrease in length so the reading $30 \,cm$ on the tape is lesser than $30 \,cm$ in real.

Standard 11

Physics

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