In a high-intensity xenon-krypton discharge lamp, the krypton fill gas reaches an operating temperature of 2400 K2400 \text{ K}2400 K. The average mass of a krypton atom is 1.4×10−25 kg1.4 \times 10^{-25} \text{ kg}1.4×10−25 kg.
What is the mean square speed of the krypton atoms at this temperature?
[Boltzmann constant kB=1.38×10−23 J K−1k_B = 1.38 \times 10^{-23} \text{ J K}^{-1}kB=1.38×10−23 J K−1]
2.4×105 m2 s−22.4 \times 10^5 \text{ m}^2 \text{ s}^{-2}2.4×105 m2 s−2
3.6×105 m2 s−23.6 \times 10^5 \text{ m}^2 \text{ s}^{-2}3.6×105 m2 s−2
4.7×105 m2 s−24.7 \times 10^5 \text{ m}^2 \text{ s}^{-2}4.7×105 m2 s−2
7.1×105 m2 s−27.1 \times 10^5 \text{ m}^2 \text{ s}^{-2}7.1×105 m2 s−2
48 exam-style questions on AQA A Level Physics Thermal physics (A-level only), covering Thermal energy transfer (A-level only), Ideal gases (A-level only), and Molecular kinetic theory model (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.