A research chamber of fixed volume contains a sample of krypton gas. The mean square speed of the krypton atoms is initially 1.8 × 105 m2 s-2. Due to a small seal leak, some of the gas escapes. A heating feedback system regulates the temperature of the gas to ensure that the pressure remains constant inside the chamber. When exactly 40% of the original krypton atoms have escaped, what is the new mean square speed of the remaining atoms in the chamber?
1.1×105 m2 s−21.1 \times 10^5\text{ m}^2\text{ s}^{-2}1.1×105 m2 s−2
3.0×105 m2 s−23.0 \times 10^5\text{ m}^2\text{ s}^{-2}3.0×105 m2 s−2
4.5×105 m2 s−24.5 \times 10^5\text{ m}^2\text{ s}^{-2}4.5×105 m2 s−2
5.0×105 m2 s−25.0 \times 10^5\text{ m}^2\text{ s}^{-2}5.0×105 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.