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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoKTGMedium2 minQB

PhysicsMediumsingle choice

The order of magnitude of the number of nitrogen molecules in an air bubble of diameter 2 mm under ordinary conditions (pressure = 1 atm; temperature = 27°C) is :

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Answer:

Solution:

$V = \frac{4}{3} π (1 0^{- 3})^{3} \approx 4.2 \times 1 0^{- 9} m^{3}$ .

$n = \frac{P V}{RT} \approx \frac{1 0 ^{5} \times 4.2 \times 1 0 ^{- 9}}{8.31 \times 300} \approx 1.7 \times 1 0^{- 7} mol . N = n N_{A} \approx 1 0^{17} .$

Stream:JEESubject:PhysicsTopic:Heat & ThermoSubtopic:KTG

⏱ 2mℹ️ Source: QB

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