Electromagnetic Waves

Electromagnetic waves can also be called

Light Waves

The transfer of energy by electromagnetic waves.

Radiation

Electromagnetic waves do not need a _________ to travel through.

Medium

Electromagnetic waves travel through

Space

Electromagnetic waves have to slow down when they have to travel through a _________.

Medium

Electromagnetic waves are _______ waves.

Transverse

Transverse waves travel at a speed of ____.

300,000 km/sec (the speed of light)

What are the different types of electromagnetic waves classified by?

Wave Length

Wave Frequency

The distance between successive crests of a wave, esp. points in a sound wave or electromagnetic wave.

Wave Length

The number of crests or troughs of a wave that passes a given point in a specified period of time.

Wave Frequency

Name 6 types of electromagnetic waves.

Radio Waves, Infrared Waves, Visible Light, Ultraviolet Light, X Rays, Gamma Rays

The different types of electromagnetic waves are displayed on a chart called the ______ _______.

Electromagnetic Spectrum

Spectrum means

that is shows all of the types fro weakest to strongest.

The weakest waves are shown on the _____ side of the scale.

Left

Waves are weakest when their wave frequencies are _____ and far apart.

Low

As electromagnetic waves get stronger, their frequency ________ and the wavelength ________.

Increases

Shortens

The frequency and wavelength are ______ _______.

(as one increases, the other decreases)

Inversely Proportional

Radiation or light waves not only carry energy but _______.

Momentum

Radiation or light waves contain tiny particle-like bundles of energy called ______.

Photons

High frequency waves correspond with ____ photon energy.

High

As the wave become stronger, the frequency ______ and the wavelength _______.

Increases

Decreases

Has the longest wavelength and the lowest frequency and the lowest photon energy.

Radio Waves

(examples: tv waves, am and fm, radar, microwave-highest energy)

Objects that contain heat give off ____ _____.

Infrared Radiation

Examples of Visible Radiation are:

Light, Sunlight

The only part of the electromagnetic spectrum that we can see is ____ ____.

Visible Radiation

Light can cause chemical reactions to occur in plants called _____.

Photosynthesis

____ _____ has more photon energy than visible light and can cause damage (sunburn, skin cancer) to the skin cells if a person is overexposed.

Ultraviolet Radiation

Ultraviolet radiation stimulated the production of _______.

Vitamin D

The natural filter in our atmosphere that protects us from the intensity of ultraviolet radiation is the _____ _____.

Ozone Layer

X Rays have a _____ wavelength and _____ frequency than the ultrviolet waves ad a higher photon energy.

shorter

higher

__ ____ pass easily through skin and muscle but when they hit dense material (bone & tooth, they are absorbed and make an x ray negative.

X rays

(used at airports and hospitals)

_____ ______ have the highest frequency and shortest wavelength of all electromagnetic waves.

Gamma Rays

Gamma rays are destructive to cells, but useful in ______ treatment.

Cancer

_____ absorbs ad protects us from x rays and gamma rays.

Lead

The only waves that we can see (light waves) are in the ____ of the electromagnetic spectrum.

Middle

The colors we see depend on the _____ of the light waves we see.

Frequency

The lowest frequency people detect is what color?

Red

The highest frequency people detect is what color?

Violet

When all colors are mixed together, the produce what?

White Light

What are the major colors?

ROY G BIV

Red, orange, yellow, green, blue, indigo, violet

An object's color without light present is what?

Black

The reflected part of light is what give objects ____.

Color

An object that is _____ allows light waves to travel through straight lines.

Transparent

What is an object called that absorbs light without giving it back out.

Opaque

Earth's atmosphere is transparent to?

some ultraviolet light, all visible light, and some infrared light

Earth's atmosphere is opaque to?

High frequency ultraviolet (give you sunburn)

Materials that allow some light to pass through are _____.

Translucent

Where light hits and is focused and send nerve impulses to the brain so you can see.

Retina

The part of the eye that distinguishes colors and detailed shapes.

Cones

The part of the eye designed to help in dim light (night vision).

Rods

If your cones and rods don't correctly mix the colors and changes your perception, you have _____ ______.

Color blindness

The color spectrum is most intense in the _____ _____ pare of the spectrum.

Yellow-green

Our eyes are most sensitive to those frequencies.

Solar radiation can be divided into what 3 main regions?

Red, green, blue

Colors that can be mixed together and produce any color in the spectrum

Additive colors

When a wave passes from one substance into another

Refraction of light

A change in the direction and intensity of light waves as they pass by an obstacle or through an opening.

Diffraction

When light waves bounce away from surface which do not absorb them

Reflection of light