Lecture Videos

• Most information is transferred via waves
• Waves transfers energy from place to place without moving matter through the use of vibrations
• Vibrations are periodic motions occurring in one place, repeating with time
• A wave is a vibration that is moving through space
• Vibration is repetitive motion in place versus wave is vibration moving through spaces
• Two types of waves: mechanical and non-mechanical
• Mechanical waves need a medium (physical material) to travel through
• Non-mechanical waves do not need a medium to travel through
• Wave is vibrations moving through space, so waves must have speed
• Velocity is frequency times wavelength or number of steps per second times the size of the steps
• Most of the time, the velocity is constant
• Two types of waves: transverse and longitudinal
• Transverse waves are where vibration motion is perpendicular to speed
• Longitudinal wave are where vibration motion is parallel to speed
• Constructive Interference is when direction of vibrations add up since they agree you get really big pulse in the center
• Destructive Interference with vibration directions added again, this time collide and temporarily cancel each other out in the middle before continuing onward on their path