Discuss Light Energy

What is the Electromagnetic Spectrum?

Name given to all of the forms of energy (its radiation) that exist

The forms of energy in the electromagnetic spectrum are what?

Radio waves

Which form of energy in the electromagnetic spectrum is used in nuclear power?

Gramma rays

Each type of energy has its own what?

Wavelengths

What is a wavelength?

Distance between successive peaks of electromagnetic waves

What is waveform?

Measurement of the distance between two wavelengths

Long wavelength have low frequency meaning what?

The number waves is less frequent (fewer waves) with a waveform pattern

Long wavelength have?

Low frequency

Short wavelengths have higher frequency meaning what?

The number of waves is more frequent (more waves) with a waveform pattern

Short wavelengths have

Higher frequency

What is characteristic of short wavelengths?

Penetrate less

What is Visible light?

The part of the electromagnetic spectrum that can be seen; visible light makes up only 35 percent of natural sunlight

What color light is considered a neutral visible light?

Green

What color has the shortest wavelength

Violet

What color has the longest wavelength

Red

Why type of light is a combination of all the visible rays of the spectrum?

White

Wavelength of light are measured in what?

Nanometers (nm)

One namometer is a?

Billionth of a meter

Visible lights was wavelengths ranges what in nanometers?

400 nanometers to 700 nanometers

Natural sunlight is made of how many types of light?

3

Natural sunlight is made up of three types of light, what are those three types?

Visible light = 35 percent

Invisible infrared light = 60 percent

Invisible ultraviolet light = 5 percent

Is ultraviolet and infrared light really lights?

No, although they are forms of electromagnetic energy, they are invisible

Why are Ultraviolet and Infrared lights inivisible?

Their wavelengths are beyond the visible spectrum of light

Invisible light makes up what?

65 percent of natural sunlight

What is Invisible light?

Light at either end of the visible spectrum of light that is invisible to the naked eye

What type of light is the shortest and least-penetrating light of the spectrum?

Invisible light

What is Ultraviolet light?

Invisible light that has a short wavelength (giving it higher energy), is less penetrating than visible light, causes chemical reactions to happen more quickly than visible light, produces less heat than visible light and kills germs

UV light prompts the skin to produce what?

Vitamin D

What is Ultraviolet light also called?

Cold light or Actinic light

What is Vitamin D

A fat-soluble vitamin that is good for bone growth and health

How many types UV light are there?

3

What are the three types of UV light?

Ultraviolet A, B and C

What is Ultraviolet A (UVA)?

The longest wavelength of the UV light spectrum and penetrates directly into the dermis of the skin, damaging the collagen and elastin. Often used in tanning beds.

What is Ultraviolet B (UVB)?

The ultraviolet most associated with sunburns.

Excessive use of both UVA and UVB can cause what?

Skin cancers

What is Ultraviolet C (UVC)

Blocked by ozone layer. Effective at killing bacteria, viruses, mold and other pathogens

Which ultraviolet light is often used in tanning beds?

Ultraviolet A (UVA)

What is the Ultraviolet B (UVB) also called?

Burning light

What type of ultraviolet (UV) rays are known as the burning light?

UVB

What happens if the Earth loses its protective layer of the ozone layer?

Life as we know it will no longer exist

Which ultraviolet light is effective at killing bacteria, viruses, mold and other pathogens?

Ultraviolet C (UVC)

What is Infrared light?

Invisible light with longer wavelengths, deeper penetration, less energy, and more heat production than visible light; makes up 60% percent of natural sunlight

Infrared light _______ penetrating and has _______ frequency than ultraviolet light?

more; lower

How much does Infrared light make up natural sunlight?

60 percent of natural sunlight

What is Catalysts?

A substance that speed up chemical reactions

What is light therapy?

The application of light rays to the skin for the treatment of wrinkles, capillaries, pigmentation, or hair removal

What is light therapy also called?

Phototherapy