OA..Does it reflect light?

Pick up ¼ sheet of OA in front

Staple to OA

Follow directions

Exit Ticket-put your name on index card

1. Write your current definition for…AmplitudeFrequencyWavelength

2. What would you change to increase frequency?

WAVESDo waves carry energy?

What evidence does this video show?

Parts of waves…Amplitude: loudness, more energyFrequency: speed, specific color (light) or pitch

(sound)

Wavelength…see frequency

• WAVE IS…• A DISTURBANCE THAT

TRANSFERS ENERGY THROUGH MATTER OR SPACE

Examples..SoundLightEarthquakesOcean waves

MEDIUM any substance thru which waves travel**

Mediums can be: - solid (earth think earthquake)- liquid (water think tsunami)- gas (air think about helium…)

**Light can travel through space and does not need a medium.

Movie Trivia. Each of these has something to do with waves

1. This movie from 1991 stars Keanu Reeves and Patrick Swayze as a pair of surfers who also rob banks.

2. In 1998, a meteor hits the earth and creates a huge wave. The tagline for this movie was "The coast is toast."

Transverse Waves – Waves travel perpendicular to direction of motion

Light• Travel in a straight line– Reflect (bounce)– Refract (bend)– Absorb

Can go through a vacuum (like space)– Fast, really fast – 300,000,000 meters/second– Light will slow down in different mediums (see refract above)

Longitudinal waves - medium moves along the same direction as the wave

Sound• Longitudinal/compressional• Needs to travel through medium…they can’t

hear you scream in space.• Speed depends on medium – Air app. 344 m/s– Steel 5000 m/s