Waves
Types
Rays
Light
Light x2
100

Do electromagnetic waves require medium (like air or water) to travel?

No. Unlike mechanical waves, EM can travel through space.

100

A low frequency, low energy electromagnetic wave that has a wavelength longer than about 30 cm is called a ________.

Radio wave

100
How many UV rays are there?
3: UV-A, UV-B, UV-C
100
How much of the Sun's energy does the Earth receive?
less than one billionth
100

What is the definition of transparent?

A material that allows almost all of the light striking it to pass through, and through which objects can be seen clearly

200
What do mechanical waves move through?
Matter
200

Microwaves carry what? (Besides cooking food)

Cell phone signal

200
Which UV wave has the longest wavelengths and least energy?
UV-A
200

About 44 percent o the Sun's energy that reaches Earth is carried by _______.

Light waves

200
What is the definition of translucent?
A material that allows most of the light that strikes it to pass through, but which objects appear blurry
300

What do electromagnetic waves move through?

Matter and empty space

300
An electromagnetic wave with a wavelength shorter than a microwave but longer than light is called an _______.
Infrared wave
300

Give me one usage of Ultraviolet Rays.

Used for sterilizing equipment to kill bacteria.

300
Light travels at a speed of _______.
3 x 10 to the 8th power m/s in empty space
300
Parallel rays reflect from what?
A smooth surface
400

An object that produces light is called what?

Luminous object

400
An electromagnetic wave with a slightly shorter wavelength and higher frequency than light is an _________.
Ultraviolet wave
400

High energy electromagnetic waves that have slightly shorter wavelength and higher frequencies than UV waves are ____________.

X Rays

400
What determines the color of light?
Wavelength and frequency of a light wave
400
An opaque object is _____________________.
The color that it reflects
500
As the wavelength of electromagnetic waves decreases, the wave frequency _________.
Increases
500
What layer in Earth's atmosphere blocks the Sun's most harmful UV rays?
Ozone layer
500

Vibrations within the nucleus of an atom produce what?

Gamma Rays

500
Reds have the _______ wavelengths and _______ frequencies of light
longest; lowest
500
What is the definition of intensity?
The amount of energy that passes through a square meter of space in one second
M
e
n
u