Wave Behavior Notes

Wave Behavior Notes

Wave Basics Review

  • Definition: Waves are disturbances that transfer energy without transferring matter.

  • They can be mechanical (e.g., sound waves) or electromagnetic (e.g., light waves).

Properties of Waves

  • Include:

    • Frequency: number of wave cycles per second

    • Wavelength: distance between wave peaks

    • Amplitude: maximum displacement from the equilibrium

Types of Waves

  • Electromagnetic Waves:

    • EMS waves do not need a medium to travel through.

    • They travel through a vacuum.

  • Mechanical Waves:

    • Mechanical waves, like sound or water waves, do need a medium to travel through (like a solid, liquid, or gas).

Wave Behaviors

  • Reflection: occurs when a wave bounces off an object and changes direction.

    • When a wave reflects off a surface, the angle of incidence is equal to the angle of reflection.

    • Examples:

    • Mirror reflection (light waves)

    • Echoes (sound waves)

    • Radar (radio waves)

  • Refraction:

    • Refraction is the bending of waves as they pass from one medium to another at an angle.

    • Refraction occurs due to a change in the speed of the light ray or wave.

    • Examples:

    • Bending of light through water.

    • The way lenses refract light in eyeglasses or cameras.

Reflection, Refraction

  • Reflection: The bouncing of waves off surfaces.

  • Refraction: The bending of waves as they pass into another medium.

Diffraction

  • Definition: Diffraction is the bending or spreading of waves as they pass through an opening or around an obstacle.

  • Types of Diffraction:

    • Single slit diffraction

    • Double slit diffraction

  • Applications:

    • Sound waves diffracting around corners.

    • Diffraction in musical instruments affecting their sound quality.

Interference

  • Definition: Interference is the interaction between waves that meet.

  • Types of Interference:

    • Constructive interference:

    • Waves combine to amplify each other.

    • Condition: When the amplitude of the initial waves is in the same direction.

    • The resulting wave will be greater than the original waves.

    • The highest point of constructive interference is called an antinode.

    • Destructive interference:

    • Waves cancel each other out.

    • Condition: When the amplitudes of the initial waves are opposite.

    • The amplitude of the resulting wave will be less.

    • The point in the middle of destructive interference is called a node and it never moves.