The volume of a gas is halved at constant temperature. The pressure:
From Paper 1: Fundamentals of physics
271 mark
kT at 300 K is 0.026 eV. What is the Boltzmann factor for an energy of 0.10 eV?
From Paper 1: Fundamentals of physics
281 mark
The mean kinetic energy of a monatomic ideal gas particle is:
From Paper 1: Fundamentals of physics
38(a)4 marks
A reaction has activation energy 0.60 eV per particle. Calculate the ratio of the Boltzmann factors at 310 K and 300 K, and explain why this suggests the rate roughly doubles.
From Paper 1: Fundamentals of physics
38(b)4 marks
A balloon holds 0.012 m³ of helium at 100 kPa and 290 K. Calculate the number of atoms and their rms speed (mass of He atom 6.64 × 10⁻²⁷ kg).
From Paper 2: Scientific literacy in physics
75 marks
Each water molecule needs about 0.42 eV to escape from the liquid. Calculate the Boltzmann factor at 300 K and the ratio of the factors at 310 K and 300 K. Explain why evaporation cools the remaining liquid.
Score 0 / 16 · 0 of 6 marked
This paper is written by Plasmo in the style of the OCR A-Level Physics exam. It is not a past paper and is not produced or endorsed by the exam board.
very simple, and hot and cold Exam Questions: OCR A-Level Physics | Plasmo