Name: Date:Subject: Do Now 1. What happens when light is absorbed ?

A. it bounces off a surfaceB. it passes through a surface C. it is trapped inside an object

D. It goes into a surface 2. What has to happen to the light in order to make a shadow?

A. it bounces off a surfaceB. it passes through a surface C. it is bent as it passes through a

surface D. it gets absorbed by an object

Daily Objective

I will identify and illustrate the parts

of a wave.

Restate Daily Objective

I will identify and illustrate the parts

of a wave.

What is a wave?•A wave energy that travels from one place to another.•If you poke a floating ball, it oscillates up and down.•The oscillation spreads outward from where it started.

Waves•When you drop a ball into water, some of the water is pushed aside and raised by the ball.

Wave Parts •Amplitude is the maximum

distance a wave vibrates from resting point•Crest is the top of a wave • Trough is the bottom of a wave •Wavelength is the distance from

one point on a wave to the same point on another • measured crest-to- crest or

measured trough-2-trough. • Frequency is the number of waves

passing a specific point over a specific amount of time. Frequency is measured in Herz(Hz)• Increase frequency and you

decrease wave energy

Disturbance- the starting place of a wave

Mechanical Waves- waves that require a medium Examples: •Ocean waves•Rope waves

Electromagnetic Waves are produced by vibration of an electrically charged particle

Hertz- The unit of measuring waves

Increasing frequency increases energy

Shorter wavelengths increases energy

Longer wavelengths increases energy

The Pitch of a wave is how it sounds

• Key Question:How do waves move?

Waves in Motion

Restate Daily Objective

I will identify and illustrate the parts

of a wave.

Name:________ Date:___________Subject:________ Performance1 Turning on a light produces visible light. In what location would this light be the

least visible?A in space C underground B under water D in a smoky room

2 How can radio waves be described?A Radio waves are mechanical waves that must move through a medium.B Radio waves are mechanical waves that require no medium.C Radio waves are electromagnetic waves that require no medium.D Radio waves are electromagnetic waves that must move through a medium.

3 Which of the following is not an example of a mechanical wave?A sunlight C ocean waves B vibrations of a guitar string D soundwaves4 What is amplitude?

A the maximum displacement from the midpoint between the crest and troughB the top of the waveC the horizontal distance the waves travelsD the number of waves that pass a specific point in a specific time &

Name:_____ Date:____Subject:___ Exit

Ticket1.Should amplitude be measured

from resting point to the crest or trough? Why?

2.How is frequency different from wavelength?