9.1 - Matter And Energy

Question 1

Wave

Answer 1

transmit energy from one place to another without moving any matter over the same distance.

Question 2

Transverse wave

Answer 2

wave involving the vibration of particles perpendicular to the direction of energy transfer
Eg. Waves on water

Question 3

Compression wave/longitude wave

Answer 3

wave involving the vibration of particles moving backwards and forwards in the same direction as energy transfer

Question 4

Medium

Plural = media

Answer 4

The material which the waves travel through

Question 5

Vibrations

Answer 5

repeated fast back-and-forth movements

Question 6

Compression

Answer 6

Region where air particles are pushed/closer together.

Question 7

Rarefaction

Answer 7

region where the particles are further apart (spread out).

Opposite to compression

Question 8

Frequency

Answer 8

number of complete vibrations or waves made in one second.

Question 9

Hertz

Answer 9

unit of frequency; its abbreviation is Hz.

One Hz is equal to one vibration every second.

Question 10

Pitch

Answer 10

Highness or lowness of sound and its sound depends on the frequency of the vibrating air.

Question 11

Wavelength

Answer 11

distance between two neighbouring crests of a wave.

Question 12

Amplitude

Answer 12

maximum distance that each particle moves away from its usual resting position (height)

• think of latitude