A steel tape gives correct measurements at 2 0 ∘ C . A piece of wood is measured with the tape at 0 ∘ C . The reading is 25 cm . The real length of the piece of wood must be:

At 0 ∘ C the tape divisions are shorter than at 20 ∘ C L t r u e = 25 [ 1 − 20 α ] cm L t r u e < 25 cm

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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoThermal ExpansionEasy2 minQB

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A steel tape gives correct measurements at $2 0^{\circ} C$ . A piece of wood is measured with the tape at $0^{\circ} C$ . The reading is $25 cm$ . The real length of the piece of wood must be:

Options:

Answer:

Solution:

At $0^{\circ} C$ the tape divisions are shorter than at $20^{\circ} C$
$L_{t r u e} = 25 [1 - 20 α] cm$
$L_{t r u e} < 25 cm$

Stream:JEESubject:PhysicsTopic:Heat & ThermoSubtopic:Thermal Expansion

⏱ 2mℹ️ Source: QB

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