State what is meant by the internal energy of a substance.
A sample of gas behaves as an ideal gas at a temperature of 320∘C320^\circ\text{C}320∘C.
The mass of a single gas molecule is 5.3×10−26 kg5.3 \times 10^{-26}\text{ kg}5.3×10−26 kg. Calculate the root mean square speed of the gas molecules at this temperature.
root mean square speed = ...........................\text{...........................}........................... m s−1\text{m s}^{-1}m s−1
Calculate the internal energy of 2.4 moles2.4\text{ moles}2.4 moles of this ideal gas at 320∘C320^\circ\text{C}320∘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.