PHY 2049L Lecture Notes - Lecture 10: Electromagnetic Radiation, Optical Fiber, Thermistor
Document Summary
Vibrations are at 90 to the direction energy is transferred. Vibrations are parallel to the direction the wave transfers energy. All waves transfer energy and information without transferring matter. All transverse - travel at same speed through a vacuum. Visible light: travel though optical fibres + photography. Process where vibrating particles pass on their kinetic energy. Particles from their hotter region to the cooler region and take their heat energy with them. Cell mutation and tissue damage - can cause cancer. Angle of incidence is less than critical angle. Angle of incidence is more than critical angle. Angle of incidence is equal to critical angle. Angle of incident is always higher than critical angle, light always totally internally reflected - only stops if fibre is to sharp. One watt = 1 joule of energy transferred per second. Small particles have a constant, rapid and random movement - small particles can move larger particles - causes pressure.
