A horizontal glass capillary open at both ends holds a mercury thread 0.5 m long at 0°C. The tube carries a scale correct at 0 ∘ C . The temperature is raised to 5 0 ∘ C . With γ H g = 1.8 × 1 0 − 4

Question

A horizontal glass capillary open at both ends holds a mercury thread 0.5 m long at 0°C. The tube carries a scale correct at 0 ∘ C . The temperature is raised to 5 0 ∘ C . With γ H g ​ = 1.8 × 1 0 − 4 and α glass ​ = 9 × 1 0 − 6 per °C, the length the scale shows is:

TestHub · Accepted Answer

Mercury volume factor 1.009; bore area factor 1 + 2 α Δ T = 1.0009 . Actual length = 0.50405 m. The scale expands by 1 + α Δ T = 1.00045 , so the reading is 0.50382 m = 0.5038 m . Option A ignores the tube, B is the true length, D ignores expansion. C.

Physics - Heat & Thermo Question with Solution | TestHub

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