Waves

Question 1

Which waves need a medium?

Answer 1

Mechanical waves (both transverse and longitudinal)

Question 2

Which type of wave is an electromagnetic wave?

Answer 2

Transverse wave
Eg light, radio, micro

Question 3

Waves transfer…
Not…

Answer 3

Energy
Matter

Question 4

Oscillations in Tansverse waves

Answer 4

Perpendicular to the direction of energy transfer (direction the wave travels)

Question 5

Oscillations in Longitudinal waves

Answer 5

Parallel to the direction of energy transfer (direction the wave travels)

Question 6

What is compression?

Answer 6

Where particles are close together creating an area of high pressure

Question 7

What is rarefraction?

Answer 7

Where particles are further apart creating an area of low pressure

Question 8

How do you find amplitude for a transverse wave on a graph?

Answer 8

Distance from the equilibrium to the position of the maximum displacement of the wave

Question 9

The trough is…

Answer 9

The maximum minimum displacement of the wave

Question 10

Wave length is…

Answer 10

The distance between two adjacent peaks/troughs

Question 11

What is frequency?

Answer 11

The number of waves that pass a point every second, Hz

Question 12

What is a period?

Answer 12

The time taken for one (full cycle) wave to pass, measured in seconds

Question 13

What is the speed of sound?

Answer 13

340m/s

Question 14

What is the speed of light?

Answer 14

3×10⁸m/s

Question 15

The 3 things waves can do

Answer 15

Absorbed
Transmitted
Reflected

Question 16

Which two angles are equal in a reflection?

Answer 16

Angle of incidence = Angle of reflection

Question 17

What is specular reflection?

Answer 17

Smooth surfaces reflecting light in the same direction
(Clear image)

Question 18

What is Diffuse reflection?

Answer 18

Rough surfaces scattering light in different directions
(Matte image with no reflection)

Question 19

Which medium do sound waves travel the fastest?

Answer 19

Solids

Question 20

What is the ear canal?

Answer 20

Air filled tube leading to the middle and inner ear

Question 21

What does the cochlea do?

Answer 21

Converts vibrations into electrical signals

Question 22

Which part of the ear sends signals to the brain?

Answer 22

Auditory nerve

Question 23

What is the human hearing range

Answer 23

20Hz to 20,000Hz

Question 24

What is the role of the ear drum?

Answer 24

Transmit the vibrations of the sound waves to the ossicles

Question 25

What is the cochlea?

Answer 25

Snail like shape Filled with fluid and lined with hair

Question 26

What are the ossicles?

Answer 26

3 small bones

Question 27

What do the ossicles do?

Answer 27

Amplify vibrations

Question 28

What is ultrasound?

Answer 28

Sound that vibrates above 20,000Hz

Question 29

What happens when ultrasound reaches a boundary? What is this called?

Answer 29

Some waves reflect back but some transmit through Partial reflection

Question 30

How to boats use ultrasound?

Answer 30

For sonar

Question 31

Which seismic wave is longitudinal

Answer 31

P-Waves

Question 32

What can P-waves travel through?

Answer 32

Solids and Liquids

Question 33

Which seismic wave is Transverse?

Answer 33

S-Waves

Question 34

What can S-Waves travel through?

Answer 34

Solids only

Question 35

Which seismic wave is the fastest?

Answer 35

P-Waves

Question 36

What are seismic waves detected with?

Answer 36

Seismometers

Question 37

Why do seismic waves refract at the boundaries of each layer?

Answer 37

They are different densities

Question 38

What a wave reaches a more dense material, what happens?

Answer 38

The wave slows down Moving towards the normal

Question 39

Convex lenses are also known as...

Answer 39

Converging lenses

Question 40

What is a real image?

Answer 40

An image formed on the other side of the lens

Question 41

What is a virtual image

Answer 41

An image formed on the same side of the object

Question 42

What is the distance between the centre of the lens and principle focus called?

Answer 42

Focal length

Question 43

What type of waves are EM waves?

Answer 43

Transverse waves

Question 44

Order the Visible light spectrum

Answer 44

R,O,Y,G,B,I,V

Question 45

Order the Em spectrum

Answer 45

Radio,Microsoft,IR,Visible,UV,X,G

Question 46

Black is the...

Answer 46

Absence of light

Question 47

What do opaque objects do to light?

Answer 47

Absorb or reflect

Question 48

What do transparent objects do to light?

Answer 48

Transmit light

Question 49

What do translucent objects do to light?

Answer 49

Transmit some light but scatter light

Question 50

How are radio waves generated?

Answer 50

With Alternating Current

Question 51

When an antenna absorbs a radio wave, what happens?

Answer 51

Charges oscillate at the same frequency as the radio wave

Question 52

Whixh waves are used for communication?

Answer 52

Radio waves Microwaves

Question 53

What damage can microwaves cause?

Answer 53

Boiled/destroyed cells

Question 54

What damage can Infrared waves cause?

Answer 54

Burns, skin cells destroyed

Question 55

A perfect black body...

Answer 55

Is the best absorber and emitter of radiation

Question 56

If more radiation is absorbed than emitted...

Answer 56

Temperature increases

Question 57

As temperature of an object increases...

Answer 57

Intensity of every emitted wavelength increases