WAVES

Chapter 23

Physical Science

REVIEW OF WAVES

Waves transfer what?

ENERGY!!!!

What are the two main types of waves?

• MECHANICAL WAVES

• ELECTROMAGNETIC WAVES

Which type of wave requires a medium?

MECHANICAL WAVESElectromagnetic waves do NOT

need a medium.

What are 3 examples of Mechanical Waves?

• Water waves

• Sound waves

• Seismic waves

What are some examples ofElectromagnetic Waves?

• Radio waves

• Microwaves

• Infrared light

• Visible light

• Ultraviolet light

• X-rays

• Gamma Rays

What are the colors of Visible Light?

• R O Y G B I V

R O Y G B I V

• RED

• ORANGE

• YELLOW

• GREEN

• BLUE

• INDIGO

• VIOLET

Which color is the HIGHEST energy wave?

• VIOLET

Which color is theLOWEST energy wave?

• RED

What 3 characteristics doAll Waves have?

• Amplitude

• Wavelength

• Frequency

What does the size of the amplitude of a wave tell us?

• HIGH AMPLITUDE = HIGH AMOUNTS OF ENERGY• LOW AMPLITUDE = LOW AMOUNTS OF ENERGY

What unit do we use to measure Wavelengths in?

• Meters

What greek letter do we useto represent a wavelength?

• Lambda

What are the 3 units we can use for Frequency of a wave?

• Waves / second

• Cycles / second

• 1/s = Hertz (Hz)

Name the 2 types of Mechanical waves.

• TRANSVERSE WAVES

• LONGITUDINAL WAVES

Which type of wave form crests and troughs?

• TRANSVERSE

Longitudinal wave do not have crests and troughs,

instead they have what?

• COMPRESSIONS

• RAREFACTIONS

How does the medium movewhen a longitudinal wave moves

through it?

• The medium vibrates horizontally.

Surface Waves move both horizontally and vertically

simultaneously, which produces what kind of movement?

• Circular

Speed of WavesWhat is the wave equation?

• V = f • speed = frequency times wavelength

The speed of a wave is held constant within a medium. So

what effect on the wavelength of a wave would you expect if the

frequency were doubled?• The wavelength would half as much.

When frequency goes up the wavelength must go down.

The density of water is 1 g/ml and the density of syrup is 3 g/ml. Which of the above would you

expect a wave to travel the slowest through?

• A wave would travel the slowest through the SYRUP.

• Waves travel slower through dense mediums.

A slinky is a very elastic object. Explain why this is used to

demonstrate wave motion instead of an object like a tree branch?

• A slinky has HIGH ELASTICITY !

• The higher the elasticity the higher the speed of a wave traveling through it.

Name the 4 ways waves interact.

• Reflection

• Refraction

• Diffraction

• Interference

Explain reflection of a wave.

• Bouncing back of a wave after it strikes a boundary.

Explain Refraction.• The change in path of a

wave when it moves into a medium of a different density.

Explain Diffraction.• The curving of waves around barriers and

ability of waves to spread out in circular pattern after passing through a narrow opening. See picture below.

What are the 2 types of Interference?

• Constructive

• Destructive

Which of the pictures below is an example of

Constructive Interference?

The picture on the left is constructive interference.The picture on the right is destructive interference.

Nodes and Antinodes are parts of what kind of wave?

• Standing Wave

The frequency at which a standing wave occurs is called

what?

• Resonant Frequency

• Sometimes called Natural Frequency.