Intro to Waves

Introduction to Waves

• Waves are disturbances that transfer energy from one place to another.

• Created when a source of energy causes a vibration—this can be either a back-and-forth or up-and-down motion.

Types of Waves

1. Transverse Waves

• Definition: Waves that move at right angles to the direction of the movement.

• Visual Concept: Think of these waves as moving "up and down."

2. Longitudinal Waves

• Definition: Waves that move in the same direction as the wave movement.

• Visual Concept: Imagine these as "compression" waves where regions of compression and rarefaction alternate.

Longitudinal Waves

• Parts of Longitudinal Waves:

  • Compressions: Regions where coils are close together.

  • Rarefactions: Regions where coils are spread apart.

  • Wavelength: The distance from one compression to the next compression.

Transverse Waves

• Parts of Transverse Waves:

  • Equilibrium: The position where the material would rest if no wave moved through it.

  • Crest: The highest point of the wave above the equilibrium.

  • Trough: The lowest point of the wave below the equilibrium.

  • Amplitude: The maximum distance moved from equilibrium (can be above or below).

  • Wavelength: The distance between two crests or two troughs.

Wave Classification

1. Mechanical Waves

• Definition: These waves require a medium to travel through.

• Medium: Can be solid, liquid, or gas.

• Examples:

  • Ocean waves

  • Sound waves

2. Electromagnetic Waves

• Definition: These waves do not require a medium to move.

• Nature: Can only be transverse waves.

• Examples:

  • Light waves

  • Radio waves

  • Microwaves