Science Unit 5 Part 2

Front 1

Wave:

Back 1

a rhythmic disturbance that carries energy but not matter

Front 2

Crest:

Back 2

The highest point above the normal level in a transverse or electromagnetic wave

Front 3

Trough:

Back 3

The lowest point below the normal level in a transverse or electromagnetic wave

Front 4

Mechanical wave:

Back 4

waves that need a medium (solid, liquid or gas) to transfer energy

Front 5

Transverse wave:

Back 5

a type of mechanical wave in which particles of the matter move in a direction perpendicular(at right angles) to the direction the wave moves.

Front 6

Longitudinal/ compression wave:

Back 6

a type of mechanical wave in which particles of the matter move forward andbackward in the same direction as the wave moves.

Front 7

Wavelength:

Back 7

the size of the wave; in transverse and EMS waves, it is the distance measures from crest to crestor from trough to trough; in compression waves, it is measured from compression to compression or from rarefaction to rarefaction.

Front 8

Amplitude:

Back 8

related to the amount of energy the wave carries; in transverse/EMS waves, it is one half the

distance from crest to trough; in compression waves, it is the radius.

Front 9

Frequency:

Back 9

the number of wavelengths that pass a given point in one second; measured in Hertz (Hz).

Front 10

Hertz (Hz):

Back 10

Units of measurement for frequency of a wave.

Front 11

Vacuum:

Back 11

an area that has no matter.

Front 12

Medium:

Back 12

any matter; a solid, liquid or gas.

Front 13

Pitch:

Back 13

how high or low a sound is.

Front 14

Echo:

Back 14

the reflection of a sound wave off of a hard surface.

Front 15

Absorption:

Back 15

the process in which a wave is retained without any reflection.

Front 16

Transmission:

Back 16

the sending out of energy.

Front 17

Electromagnetic wave:

Back 17

a special type of transverse wave that does not need matter to carry energy.

Front 18

Electromagnetic spectrum:

Back 18

range of electromagnetic waves with different frequencies and wavelengths.

Front 19

Reflection (angle/law):

Back 19

occurs when a wave strikes an object and bounces off.

Front 20

Refraction (angle/law):

Back 20

bending of a wave as it moves from one medium into another medium.

Front 21

Opaque:

Back 21

not transmitting or reflecting any light.

Front 22

Translucent:

Back 22

allowing a limited amount of light to pass through.

Front 23

Transparent:

Back 23

allowing light to pass through an object almost undisturbed, such that one can see through the ob-ject clearly.

Front 24

Conduction:

Back 24

heat transfer that occurs in objects that are in direct contact.

Front 25

Radiation:

Back 25

heat transfer that requires no contact between the heat source and the heated object; travels athigh speeds and long distances.

Front 26

Convection:

Back 26

Heat transfer in a gas or liquid (fluids) by the circulation of currents from one region to another.