IB Physics-Theme C Paper 2-Qc#5 -Snell's Law -Total internal reflection

A large cube is formed from ice. A light ray is incident from a vacuum at an angle of 46˚ to the normal on one surface of the cube. The light ray is parallel to the plane of one of the sides of the cube. The angle of refraction inside the cube is 33˚.
-Calculate the speed of light inside the ice cube.
-Show that no light emerges from side AB.
-Sketch, on the diagram, the subsequent path of the light ray.
Each side of the ice cube is 0.75 m in length. The initial temperature of the ice cube is –20 °C.
-Determine the energy required to melt all of the ice from –20 °C to water at a temperature of 0 °C.
Specific latent heat of fusion of ice = 330 kJ kg–1
Specific heat capacity of ice = 2.1 kJ kg–1 k–1
Density of ice = 920 kg m–3
- Outline the difference between the molecular structure of a solid and a liquid

Topic 4 and topic 9 oscillation and waves: