Light

What is the speed of light in empty space?

3x10 to the 8th m/s

How many types of electromagnetic waves are there in the electromagnetic spectrum?

7, these waves have different wavelengths, frequency, and energy.

______________ is the person's perception of the light intensity.

Brightness

_____________ is the amount of energy that passes through 1 m(2) of space in 1 second.

Intensity

More than 90% of the Suns energy that reaches Earth is carried by___________and __________.

Light and Infrared Waves

What is Light?

Light is a small range of electromagnetic waves that are detected by most people's eyes.

What are luminous objects?

Objects that produce light, including the Sun and light bulbs, are luminous objects.

________ of sunlight causes the Sun to be visible even after it has set below Earth's _________.

Rays, horizon

The light color that has the Longest wavelength and the Lowest frequency is________.

Red

Cells in the retina ________ light and send signals about the light to the ________.

absorb, brain

How does the Suns energy get carried out?

carried outward in all directions as electromagnetic waves.

Light enters the eye through the _________ which, along with the _________, focuses light onto the ________.

cornea, lens, retina

Intensity varies with __________ from the light source; the ______________ the source, the greater the intensity of the light.

distance, greater

Light interacts with different types of _________ in different ways; some of the light is reflected, and some is transmitted or ____________.

matter, absorbed

Light does not pass through _________ material.

opaque

Objects that are ________ absorb all of the wavelengths of light except the wavelengths of the color that people see when white light hits the object; so the _________ of an opaque object is the color of the light that the object ______.

opaque, color, reflects

Particles that make up the air _________ the blue wavelength of light more than they scatter longer wavelengths.

scatter

You see a clear reflective image when rays reflect from a ________ surface.

smooth

What determines the color of light?

the wavelength and frequency of light

A ___________ material allows most of the light that strikes it to pass through; objects appear ________ through this material.

translucent, blurry

the color of a transparent or translucent object is the color the object ________.

transmits

A __________ material allows almost all the light that strikes it to pass through; objects can be seen ________ through this material.

transparent, clearly

Colors at the violet end of the spectrum have the shortest _______ and the __________ frequency.

wavelength , highest

Colors people see are due to________ of the light that enters their ______; with a __________ object, the colors are the wavelengths emitted by the object.

wavelengths, eye, luminous