|
|
|
4
|
a wave that moves through space, made of magnetic and electric fields
|
|
6
|
how quickly something happens over and over again
|
|
8
|
the number of waves moving in a certain space each second
|
|
10
|
the part of your body that helps you breathe by pushing and pulling your lungs
|
|
11
|
the gases around an object in space (on Earth this is air)
|
|
13
|
moves up, down, or to the side
|
|
15
|
letting some light through
|
|
16
|
objects that take in and store solar energy
|
|
17
|
the outside of something
|
|
19
|
letting light through
|
|
20
|
all of space
|
|
21
|
any substance or material through which something (like sound waves) can move
|
|
|
|
|
|
|
1
|
the place from which something starts
|
|
2
|
not letting light through
|
|
3
|
can be seen
|
|
4
|
all the frequencies in which light waves, radio waves and other similar wave can be found
|
|
5
|
the power to work or to act
|
|
7
|
how high or low a sound is
|
|
9
|
a space without air or any other matter
|
|
12
|
to make clear
|
|
14
|
a musical note, the sound of one note
|
|
18
|
clear, curved objects that focus light
|
|
|
|
