Electromagnetic Spectrum & Light

What can Electromagnetic waves travel through?

Empty Space and through matter

How do they travel

Vibrations in electrical/magnetic fields and in their properties

How fast do they travel?

300 Billion meters per second

- Number of waves to cross a point in 1 second

Frequency

What is a frequency?

Number of waves to cross a point in 1 sec.

What does a spectrum show?

Range of energy from low to high energy

High frequency waves have ____ wavelengths

Short

Low frequency waves have ____ wavelengths

Long

What is electromagnetic spectrum order? (Longest ->Shortest)

Radio, Microwave, Infrared, Visible, Ultraviolet, X-rays, Gamma Rays

Wavelengths of a Radio Wave

Long wavelengths, low energy/ frequency

Wavelengths of a Gamma Wave

Short wavelengths, high energy/ frequency

What are Radio Waves used for?

FM/AM Radios, Medical Machines (MRI)

What are Microwaves used for?

Microwave Ovens, Cellphones, pagers, and RADAR

What are infrared waves used for?

Heat lamps, thermograms

What is visible light?

Light we can see as different colors.

Highest wavelengths in visible light spectrum?

Red

Shortest wavelength in visible light spectrum?

Violet

How does the human eye see colors?

When they are bent

When do we see white light?

When all the colors are being reflected

When do we see black light?

When all the colors are being absorbed

What are UV Rays used for?

To kill bacteria, Helps skin produce Vitamin D

What can happen if you are exposed to UV Rays too much?

Can cause skin cancer

What are X-Rays used for?

Bones and teeth can absorb it, can penetrate matter

Exposure to too much X-Rays can cause____

Cancer

What are Gamma Rays used for?

Radiation treatment to kill cancer cells.

- Form of energy that travels as a wave

Light

What type of animals can see uv light?

Bees

- Wave made of changing electric and magnetic field strengths

Electromagnetic wave

What do some infrared waves from the sun do?

Give off warmth and keeps living things on Earth warm.

What gives off infrared waves?

All objects including humans.We give it off when we don't absorb a color or light and reflect it.

What does visible light do?

Changed into chemical energy by green plants during photosynthesis