Wave Motion Review Lab What affects frequency What

Wave Motion

Review Lab • What affects frequency?

What is a Wave? • The transfer of energy through a medium • Source of energy is needed to creates vibration that can be passed through a medium

Earth: A Biography • Let’s take a look!

Terminology • Pulse – a single disturbance • Periodic wave – wave where the motion is repeated at a regular time interval

Transverse Wave • The motion of the particles in the medium is at right angles to the direction in which the wave travels

Terminology • Crest – high section of the wave • Trough – low section of the wave • Wavelength ( )- distance between successive wave particles that are in-phase (at the same place moving in the same direction) http: //surendranath. tripod. com/Applets/Waves/ TWave 01/TW 01. html

Drawing Transverse Waves • Draw a periodic transverse wave consisting of two wavelengths with an amplitude of 2 cm and λ = 3. 0 cm

Longitudinal Wave • particles vibrate parallel to the direction of the motion of the wave

Terminology • Compressions: areas where particles come closer together • Rarefactions: regions where particles are further apart http: //surendranath. tripod. com/Applets/Waves/ LWave 01/LW 01. html

Homework! Draw the following waves: • Draw 3 waves with A = 1. 0 cm and λ = 2, 0 cm • Draw 2 wavelengths A = 1. 5 cm and λ = 4. 0 cm • Draw 4 wavelengths A = 1. 0 cm and λ = 1. 0 cm