Waves

Question 0

Transverse waves

Answer 0

The medium moves at right angles to the direction of the motion of the wave

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Question 1

Diffraction

Answer 1

The spreading of waves as they pass by edges of an obstacle

Sound waves bend round corners

Question 2

Longitudinal waves

Answer 2

The medium moves in the same direction as the motion of the wave

____…………___…....……..._______..……………..__…..___._.

Question 3

Wavelength

Answer 3

Top of wave to top of wave

Question 4

Period of wave

Answer 4

Wave crosses the black line to same part of wave crosses the black line / Time taken for the source to produce one wave

Question 5

Amplitude (wave)

Answer 5

Black line to the top of the wave

Question 6

Analogue electrical signals

Answer 6

Continuously variable voltages

Question 8

Digital electrical signals

Answer 8

Only have values of 0 and 1 in the binary number system

Question 9

Advantages of digital (4)

Answer 9

Digital doesn’t pick up interference
Eliminates unwanted noise
Much more information can be conveyed this way
Cleaner

Question 9

Sound (3)

Answer 9

Longitudinal wave
Can’t travel through a vacuum

Can: reflect(echoe), refract, diffract

Question 10

Amplitude (sound)

Answer 10

Loudness

Question 11

Pitch

Answer 11

Effected by frequency

Question 12

Total internal reflection

Answer 12

Happens when travelling through a more optically dense material into a lesser one

Slow speed to quick

Question 13

Refraction of light

Answer 13

Te bending of light happens when travelling through differ materials

Question 14

Refraction- into glass

Answer 14

Bent towards the normal

Question 15

Refraction- out of glass

Answer 15

Bent away from the normal

Question 16

Incident ray

Answer 16

Light beam entering glass

Question 17

Refractive ray

Answer 17

Light beam just in glass

Question 18

Electromagnetic spectrum

Increasing frequency-decreasing wavelength

Answer 18

Radio waves
Microwaves
Infrared
Visible light
Ultraviolet
X-rays
Gamma rays

Question 19

Colours of the electromagnetic spectrum

Answer 19

Red 
Orange
Yellow
green 
Blue 
Indigo 
Vicolet

Question 20

Light waves

Answer 20

Angle of incidence = Angle of reflection
Transverse
90* normal hitting the mirror

Question 21

Electromagnetic waves

Answer 21

Are transverse

Do not use a material medium to Travel

Question 22

Speed of electromagnetic waves

Answer 22

Through a vacuum 300,000,000 m/s

Question 23

Uses of radio waves

Answer 23

Communication of information

Question 24

Problems of x-rays

Answer 24

Cell mutation and cancer

Question 25

X-rays

Answer 25

To examine bones

Question 26

Uses of Microwaves

Answer 26

Heating food,satellite communication and radar

Question 27

Problems of microwaves

Answer 27

Can directly heat internal body tissue

Question 28

Uses of Infrared

Answer 28

Heating devices, night vision cameras

Question 29

Dangers of infrared

Answer 29

Absorbed by our skin, results in burns

Question 30

Visible light

Answer 30

Photography, optic fibres

Question 31

Uses of ultraviolet

Answer 31

Fluorescent lamps, sterilising water

Emitted by the sun

Question 32

Problems of ultraviolet

Answer 32

Skin cancer, damage to the eyes