# What is the purpose of a wave?

## Presentation on theme: "What is the purpose of a wave?"— Presentation transcript:

What is the purpose of a wave?
To carry energy through matter or space. Or, to transfer energy

Mechanical waves require a medium and electromagnetic do not.
What waves require a medium to travel or do they all require a medium to travel? Mechanical waves require a medium and electromagnetic do not.

What are longitudinal waves?
Waves that vibrate parallel to the direction of the wave.

What are electromagnetic waves?
Waves of oscillating electric and magnetic fields

What is the height of a wave called?
Amplitude

What are transverse waves?
Move perpendicular to the direction of the wave

Bending of a wave around an opening or corner.
What is diffraction? Bending of a wave around an opening or corner.

Draw and label a wave and its five main parts.
See the board

What is the difference between a mechanical wave and an electromagnetic wave?
Mechanical requires a medium Electromagnetic waves do not require a medium

What are sound waves? Be able to give at least one example.
Waves that move out in spherical fronts. Exp – iPods, stereos, etc.

What types of waves are sound waves?
Longitudinal

What makes sound soft or loud?
Amplitude

What measures the amount of energy in a sound wave?
Decibels

What is pitch and what determines pitch?
Pitch is the level of a particular sound and it is determined by frequency.

What determines loudness?
Pressure, Volume, or Intensity

Light scattering on a rough surface is called what?
Diffuse reflection

What is the wavelength of red light?
700 nm

What is the wavelength of violet light?
400 nm

What is another name for a flat mirror?
Plane

What is the name of a mirror that bends inward?
Concave

What is the name of a mirror that bends outward?
Convex

How does light travel? In transverse waves

What is the law of reflection?
The angle of incidence of a light ray is equal to the angle of reflection of the same light ray.

List the waves included in the electromagnetic spectrum from low frequency to high frequency.
Radio waves, microwaves, infrared waves, visible light, UV , X-rays, and Gamma

Angle of Incidence Normal Angle of Reflection Reflecting Surface

Describe three ways light is related to waves.
To transfer energy Travel in waves Color is reflected as light waves Produce interference waves like water

Red, Orange, Yellow, Green, Blue, Indigo, Violet ROY G BIV
Name the colors of the visible light spectrum from longest wavelength to shortest wavelength. What is the acronym used to help remember the order of the visible light spectrum? Red, Orange, Yellow, Green, Blue, Indigo, Violet ROY G BIV

Sound is a series of atmospheric pressure waves produced by what?
Vibrations