Unit 4, waves,10

Question 1

Amplitude

Answer 1

The height of a wave, measured in meters, represents how loud the sound it.

Question 2

Wavelength

Answer 2

How long wave is, measured in meters, represents the pitch of wave. A shorter wavelength = a higher pitch

Question 3

Trough

Answer 3

The lowest point in a wave from

Question 4

Peak/crest

Answer 4

The highest point in a wave from

Question 5

Frequency

Answer 5

How many waves there are per second, measured in Hertz ( Hz)

Question 6

Transverse waves

Answer 6

In a transverse wave, the
particles move up and down,
so the direction of their
movement is at right angles
to the direction of the wave.
Example water

Question 7

Longitudinal waves

Answer 7

In a longitudinal wave, the
particles vibrate back and forth,
so the direction of their
movement is parallel to the
direction of the wave. Example sound.

Question 8

Compressions

Answer 8

Sections that are pushed together

Question 9

Rarefaction

Answer 9

Sections that are stretched out

Question 10

Wavelength

Answer 10

The distance between two matching points on neighbouring waves.

Question 11

Units of speed

Answer 11

m / s

Question 12

Units of frequency

Answer 12

Hz

Question 13

Units of Wavelength

Answer 13

m

Question 14

Electro magnetic spectrum from lower frequency

Answer 14

Radio waves, micro waves, infrared, visible light, ultra violet, x-rays, gamma rays. Frequency increases, wavelength decreases

Question 15

Refraction of light waves

Answer 15

Waves change direction as they from 1 medium to another.

Question 16

Refraction of light waves, in glass

Answer 16

Wave is slow down, higher dentistry = slower wave

Question 17

Angle of incidence = angle of reflection

Answer 17

They are equal

Question 18

Formula of wave speed

Answer 18

V = f * л

Question 19

Transverse

Answer 19

Oscillations are Perpendicular to the Direction of energy transfer.
Waves are up, down

Question 20

Longitudinal

Answer 20

Oscillations that are Parallel to the Direction of energy transfer.
Waves are spread out and commpressed

Question 21

Gamma, uses

Answer 21

Kills harmful bacteria in food,
sterilising surgical equipment, killing
cancer cells.

Question 22

Gamma, danger

Answer 22

High doses can kill cells. Lower doses
can cause cells to become
cancerous.

Question 23

X-rays, uses

Answer 23

Shadow pictures of
luggage and inside the
human body.

Question 24

X-rays, danger

Answer 24

High doses can kill cells.
Lower doses can cause
cells to become cancerous.

Question 25

Ultra violet, uses

Answer 25

Sun beds, fluorescent lamps and security marking.

Question 26

Ultra violet, danger

Answer 26

High doses can kill cells. Lower doses can cause cells to become cancerous.

Question 27

Light

Answer 27

Seeing and endoscopes

Question 28

Light, danger

Answer 28

Blindness

Question 29

Infrared, uses

Answer 29

Remote controls (TV/VCR), radiant heaters, grills, optical fibre communication, night vision.

Question 30

Infrared, danger

Answer 30

Skin burns

Question 31

Microwaves, uses

Answer 31

Satellite communication, mobile phone networks, cooking, RADAR.

Question 32

Microwaves, danger

Answer 32

Internal tissue heating.

Question 33

Radio waves, uses

Answer 33

Communication and astronomy.