Physics - Heat & Thermo Question with Solution | TestHub
PhysicsHeat & ThermoThermal ExpansionMedium2 minQB
PhysicsMediumsingle choice
Arrange the following statements in the correct logical order to explain why evaporation cools a liquid. P: Molecules at the surface with above-average kinetic energy escape. Q: The average kinetic energy of the remaining molecules is lower. R: The temperature of the liquid falls. S: Heat flows in from the surroundings to partly restore the temperature.
Options:
Answer:
A
Solution:
The fast molecules leave first (P), which lowers the average kinetic energy of the rest (Q), so temperature falls (R), after which heat from surroundings flows in (S). Order P, Q, R, S. Answer (A).
Subject:PhysicsTopic:Heat & ThermoSubtopic:Thermal Expansion
⏱ 2mℹ️ Source: QB
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