QuestionStates of matter / kinetic theory
The speed of particles in a matter usually increases with a rise in temperature. Which one of the following phenomena is responsible for it?
- (a) An increase in kinetic energy
- (b) A decrease in kinetic energy
- (c) An increase in decomposition
- (d) A decrease in reaction rate
Answer: (a) An increase in kinetic energy
Heat supplied to matter is converted into kinetic energy of its particles. Average KE = \(\frac{3}{2}kT\), so KE rises in direct proportion to absolute temperature and the particles move faster. Decomposition and reaction rate have nothing to do with the speed of particles of a pure substance. → (a)