Start Free Mock LoginAlready registered? Login here

Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoThermodynamics Laws & Specific Heats of GasesMedium2 minQB

PhysicsMediumsingle choice

14 g of nitrogen is contained in a vessel at 300 K. How much heat should be taken out of the gas to halve the rms speed of its molecules? ( $R = 2$ cal/mol K)

Options:

Answer:

Solution:

$v_{r m s} \propto T$ , so halving $v_{r m s}$ gives $T = 75$ K, $Δ T = 225$ K. $n = 0.5$ mol, $C_{v} = \frac{5}{2} R = 5$ cal/mol K. $Q = 0.5 \times 5 \times 225 = 562.5$ cal. B.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Thermodynamics Laws & Specific Heats of Gases

⏱ 2mℹ️ Source: QB

Doubts & Discussion

Loading discussions...