1. The problem statement, all variables and given/known data What is the ratio of the average speed of an atom of neon to another atom of neon at twice the temperature? (A) 1:1 (B) 1:1.4 (C) 1:2 (D) 1:4 2. Relevant equations KE = 3/2RT 3. The attempt at a solution I used the above equation and substituted 2 for T for twice the temperature and 1 for half of that: KE=3/2RT = 3R KE=3/2RT = 3/2R My ratio is 3:1.5. The correct answer is B. So kinetic energy is proportional to temperature, but what is the relationship between speed and kinetic energy?