MJ18 P41 Q3 Gas Internal Energy | May/June 2018 | Cambridge A Level 9702 Physics
9702/41/M/J/18: (a) (i) State what is meant by the internal energy of a system.
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(ii) Explain why, for an ideal gas, the change in internal energy is directly proportional to the change in thermodynamic temperature of the gas.
(b) A cylinder of volume 1.8 × 10^4 cm^3 contains helium gas at pressure 6.4 × 10^6 Pa and temperature 25 °C. Helium gas may be considered to be an ideal gas consisting of single atoms. Calculate the number of helium atoms in the cylinder
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