Physics Paper 1- Thermal Physics

Cards (10)

Why is absolute scale used?

0K means the particles have 0 internal energy
Doesn't depend on the properties of a given substance
How does brownian motion give evidence for the particle model of matter?
Smoke particles in air can be seen to move in random directions which shows evidence for random collisions
How do you increase the thermal energy of a system?
Increase the temp or do work on the object
What energy changes occur when an object changes state?
The potential energy of the particles change but the kinetic energies stay the same
What is avagadros constant in words?
The number of atoms there are in one mole of a substance
What are the 5 key assumptions in the kinetic Theory of gasses?
They move in random motions
The collisions are perfectly elastic
They have neligible volume compared to the volume of the gas
Between collisions there is 0 forces between the particles
The time taken between collisions is neligible
Why do gases exert a pressure on the container they are in?
They collide with the surface of container
The container exterts a force on the particles to change their direction
N3 law- Particles exert an equal and opposite force on the container
Pressure is the force per unit area
What is boyles law?
Pressure is inversly proportional to volume if temp is constant
What is charles law?
Volume is directly proportional to the temprature if the pressure is constant
What does the area under a maxwell-boltzmann curve represent?
The total number of particles