Pearson Edexcel International A Level · Physics (YPH11)
5 multiple-choice questions marked as you go, and 1 written questions with worked solutions. All on Thermodynamics and Ideal Gases.
A block of ice with a mass of \(0.50\text{ kg}\) at \(0^{\circ}\text{C}\) is heated until it melts completely into water at \(0^{\circ}\text{C}\). If the specific latent heat of fusion of ice is \(3.34 \times 10^5\text{ J kg}^{-1}\), calculate the change in the internal energy of the substance during this process, assuming no work is done against the surroundings.
An ideal gas is contained in a cylinder of volume \(V\) at a pressure \(p\). The gas contains \(N\) molecules, each of mass \(m\). Which of the following expressions correctly represents the root-mean-square speed, \(c_{\text{rms}}\), of the molecules?
A container holds an ideal gas at a temperature of \(27^{\circ}\text{C}\). If the average kinetic energy of the gas molecules is to be doubled, what must be the new temperature of the gas?
A mass of \(0.20\text{ kg}\) of a liquid is heated by an electric heater rated at \(50\text{ W}\). The temperature of the liquid increases from \(20^{\circ}\text{C}\) to \(50^{\circ}\text{C}\) in \(120\text{ s}\). Assuming that \(20\%\) of the energy supplied by the heater is lost to the surroundings, calculate the specific heat capacity of the liquid.
A sealed flask contains a mixture of Helium (molar mass \(4\text{ g mol}^{-1}\)) and Argon (molar mass \(40\text{ g mol}^{-1}\)) at thermal equilibrium. What is the ratio of the root-mean-square speed of Helium atoms to that of Argon atoms, \(\frac{v_{\text{He}}}{v_{\text{Ar}}}\)?
A cylinder contains 0.40 moles of an ideal monatomic gas. The average kinetic energy of the gas atoms is increased by \(1.2 \times 10^{-21}\text{ J}\).
Calculate the change in the root mean square speed of the atoms if their initial root mean square speed was \(450\text{ m s}^{-1}\).
(Mass of one atom \(= 6.64 \times 10^{-27}\text{ kg}\))
Write your answer out first, then check it against the worked solution.
* The content provided by thinka is generated by AI and may not always be accurate or up-to-date. Please use it as a supplementary resource and verify with official materials.
This page can show you how a good answer looks. It cannot tell you what your answer was missing. thinka marks your written work against the real mark scheme in about 15 seconds.
Want more questions like these? Get a fresh set on this topic, graded as you go.
Practice More