State what is meant by the internal energy of a substance.
A sample of Xenon gas, enclosed in a scientific containment chamber aboard a planetary lander, behaves as an ideal gas at a temperature of 475∘C475^\circ\text{C}475∘C.
The mass of a single Xenon atom is 2.2×10−25 kg2.2 \times 10^{-25}\text{ kg}2.2×10−25 kg. Calculate the root mean square speed of the Xenon atoms at this temperature.
root mean square speed = ...........................\text{...........................}........................... m s−1\text{m s}^{-1}m s−1
Calculate the internal energy of 3.6 moles3.6\text{ moles}3.6 moles of this ideal gas in the chamber at 475∘C475^\circ\text{C}475∘C.
internal energy = ...........................\text{...........................}........................... J\text{J}J
56 exam-style questions on OCR A A Level Physics Thermal physics, covering Temperature, Solid, liquid and gas, Thermal properties of materials, and Ideal gases. Each one has a worked solution and a mark scheme showing where the marks go.