An aluminium measuring rod correct at 5 ∘ C reads a line as 80 cm at 4 5 ∘ C . For α = 2.50 × 1 0 − 5 ∘ C − 1 , the true line length is:

L true = L read ( 1 + α Δ T ) . L true = 80 [ 1 + ( 2.5 × 1 0 − 5 ) ( 40 ) ] = 80.08 cm .

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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoThermal ExpansionMedium2 minQB

PhysicsMediumsingle choice

An aluminium measuring rod correct at $5^{\circ} C$ reads a line as 80 cm at $4 5^{\circ} C$ . For $α = 2.50 \times 1 0^{- 5}^{\circ} C^{- 1}$ , the true line length is:

Options:

Answer:

Solution:

$L_{true} = L_{read} (1 + α Δ T)$ . $L_{true} = 80 [1 + (2.5 \times 1 0^{- 5}) (40)] = 80.08 cm$ .

Subject:PhysicsTopic:Heat & ThermoSubtopic:Thermal Expansion

⏱ 2mℹ️ Source: QB

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