A container holds an ideal gas. The mean square speed of the gas molecules in the container is 2.4 × 105 m2 s-2.
Over a period of time, a quarter of the gas molecules escape from the container. The pressure and volume of the gas in the container remain the same.
What is the mean square speed of the molecules left in the container?
0.6×105 m2 s−20.6 \times 10^5\text{ m}^2\text{ s}^{-2}0.6×105 m2 s−2
1.8×105 m2 s−21.8 \times 10^5\text{ m}^2\text{ s}^{-2}1.8×105 m2 s−2
3.2×105 m2 s−23.2 \times 10^5\text{ m}^2\text{ s}^{-2}3.2×105 m2 s−2
9.6×105 m2 s−29.6 \times 10^5\text{ m}^2\text{ s}^{-2}9.6×105 m2 s−2
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.