Waves and Energy Transfer Surfs Up Braaaaaaah Waves

Waves and Energy Transfer Surf’s Up Braaaaaaah

Waves and Energy Transfer • A wave is an oscillation accompanied by energy that travels through space or mass. • Mechanical waves require material to travel through, like sound waves, water waves, springs or ropes. • Electromagnetic waves travel through space, therefore do not require a medium. They have a fixed speed of 299, 792, 458 m/s. We call this c = speed of light.

Waves and Energy Transfer • Two types of mechanical waves • Transverse Wave = particles of the medium vibrate perpendicular to the direction of motion (ex. guitar strings) • Longitudinal (Compression) Wave = particles of the medium vibrate along with the direction of the motion (ex. water waves)

Waves and Energy Transfer • For Transverse Waves: The peaks are called crests, and the dips are called troughs. • For Longitudinal Waves: The dense parts are called compressions and the spaced out parts are called rarefactions.

Waves and Energy Transfer • The distance between two crests, two troughs, two compressions etc. is the wavelength • How often a vibration occurs per second is the frequency • The units for frequency is hertz (Hz). It is the same as 1/seconds

Waves and Energy Transfer •

Waves •

Waves and Energy Transfer • The amplitude of a wave is the maximum displacement the wave has from its equilibrium point. • For compressional waves its how dense the compressions are

Waves and Energy Transfer • The energy a wave has varies as the square of the amplitude • If you double the amplitude of a wave, you quadruple the energy. 2 x Amplitude -> 2² x Energy • The wavelength and frequency can also affect the energy a wave has.

Waves and Energy Transfer • Assignments for period 8 • Worksheet handout, due ASAP • Book problems pg 293 1 -4, due Wednesday 1/27 • For number 3 and 4 remember the speed of light.