IB Physics HL B 1 5 Kelvin Temperature and Kinetic Energy Topic Practice

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Study B.1.5—Kelvin temperature and kinetic energy conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

Question 1

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Ceres is a dwarf planet in the asteroid belt. The following data are available.

 Mean distance of Ceres from the Sun =4.4×1011 m Mean power output of the Sun =3.8×1026 W\begin{array}{ll} \text { Mean distance of Ceres from the Sun } & =4.4 \times 10^{11} \mathrm{~m} \\ \text { Mean power output of the Sun } & =3.8 \times 10^{26} \mathrm{~W} \end{array}

At low temperatures such as the mean temperature of Ceres, water undergoes a phase change directly from solid to gas.

The maximum surface temperature of Ceres is −38∘C-38^{\circ} \mathrm{C}. Observations show that significant quantities of water vapour are released from the surface of Ceres every second when the temperature is at this maximum. Calculate the mean kinetic energy of a molecule of water vapour at this temperature.

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