PHL210Y1 Lecture Notes - Wrinkle

When a substance is being heated, there is a time when the amount of energy added to the substance increases without any temperature change of the substance. Identify what this situation is called and explain what happens to the energy that was added to the substance.

Each molecule of substance X can exist in either of 2 states; thesestates differ in energy by 25 eV.

If one mole of substance X is in equilibrium at room temperature,what is teh fraction of atoms in the excited state?

What is the heat capacity of substance X as a function oftemperature?

You can determine the index of refraction of a substance by determining its critical angle.

(a) What is the index of refraction of a substance that has a critical angle at 68.4° when submerged in water? What is the substance based on the table?

(b) What would be the critical angle of this substance in the air?