7Th Science Ch. 15 Waves

Front 1

The material through which a waves travels is called what?

Back 1

medium

Front 2

Waves that require a medium through which to travel?

Back 2

mechanical waves

Front 3

Waves such as light can travel through empty space and don';t need a medium are called?

Back 3

electromagnetic waves

Front 4

A repeated back and forth or up and down motion is called ?

Back 4

vibration

Front 5

Waves that move particles in the direction in which the wave is moving is called what/?

Back 5

Longitudinal waves

Front 6

The waves that move the medium at right angles to the direction which waves are traveling are called ?

Back 6

Transverse waves

Front 7

Compressions are when the coils are _____ together?

Back 7

close

Front 8

______ are when the coils are far apart?

Back 8

Rarefactions

Front 9

Crest is the ____- part of the wave

Back 9

highest

Front 10

______ is the lowest part of the wave

Back 10

TROUGHS

Front 11

SURFACE WAVES are combinations of _____ and _____ waves that occur at the surface between 2 mediums

Back 11

transverse and longitudinal

Front 12

Water and air making a circular motion is an example of _____ waves?

Back 12

surface

Front 13

The maximum distance the particles of the medium carry the wave move away from their rest position is called ___?

Back 13

AMPLITUDE

Front 14

AMPLITUDE OF TRANSVERS WAVES is what?

Back 14

the maximum distance the wave moves up or down from the rest position (crest and troughs)

Front 15

AMPLITUDE OF LONGITUDINAL WAVES is what ?

Back 15

the measure of how compressed or rarefied the medium becomes

Front 16

The distance between the crest and the trough of one wave and the crest and trough of another corresponding wave is?

Back 16

Wavelength

Front 17

Frequency is?

Back 17

the number of complete waves that pass a given point in a period of time

Front 18

Hertz is what ?

Back 18

unit of frequency.1 Hz= 1 wavelength per second

Front 19

When a wave hits a surface through which it cannot pass, and it bounces back that is called?

Back 19

REFLECTION

Front 20

Angle of incident is?

Back 20

the angle between the INC0MING wave and imaginary perpedicular line

Front 21

Angle of reflection is?

Back 21

the angle between the reflected wave and the imaginary perpediculary line.

Front 22

Refracted waves move frome one medium to another causing it to ____>

Back 22

bend

Front 23

A change in medium causes a change in ______.

Back 23

speed

Front 24

When a wave passes a barrier or moves through a hole in a barrier, it bends and spreads out, which is called?

Back 24

Diffraction

Front 25

When 2 or more waves meet, it is called what?

Back 25

INTERFERENCE

Front 26

When the 2 more waves that meet combine to make a wave with a larger amplitude, it is called?

Back 26

CONSTRUCTIVE INTERFERENCE

Front 27

When the amplitude of 2 waves combine and produce a smaller amplitude it is called ?

Back 27

DESTRUCTIVE INTERFERENCE

Front 28

If the incoming wave and reflected wave combine at the right places and appear to be standing, what is that called?

Back 28

STANDING WAVE

Front 29

Nodes are?

Back 29

the point where destructive interference causes 2 waves to combine and produce zero amplitude

Front 30

Antinodes are

Back 30

2 waves that combine to produce an amplitude greater than zero. (standing waves crests and troughs)

Front 31

Seismographs are ____ use to record ground movements cause by seismic waves

Back 31

instruments