P12 - Waves

Question 1

What do waves transfer?

Answer 1

They transfer energy

Question 2

What is a wave?

Answer 2

A series of ocillations that travel from one place to another, using energy

Question 3

Waves transfer energy without transferring any __________

Answer 3

Matter

Question 4

What is the aplitude of wave?

Answer 4

The maximum displacement of a point on a wave from its undisturbed position

Question 5

What is the wavelength?

Answer 5

The distance between the same point on two adjacent lines

Question 6

What is the frequency of a wave?

Answer 6

The number of complete waves passing a certian point per second

Question 7

What is frequency measured in?

Answer 7

Hertz (Hz)

Question 8

What does 1Hz equivalate to?

Answer 8

1Hz = 1 wave per second

Question 9

What are the two types of waves?

Answer 9

Transverse waves
Longitudinal waves

Question 10

How can you find the Period of a wave with frequency?

Answer 10

T = 1/f

T(period) (s)
f(frequency) (Hz)

Question 11

What is the Period of an Oscillation?

Answer 11

The time it takes for one full oscillation happen

Question 12

What is another word for oscillation?

Answer 12

Vibration

Question 13

What is another word for oscillation?

Answer 13

Vibration

Question 14

What are the oscillations like in transverse waves?

Answer 14

The direction of oscillation is perpendicular to the direction of a wave motion

Question 15

What are the oscillations like in a longitudinal wave?

Answer 15

The direction of oscillatioj is parallel to the direction of wave motion

Question 16

What are some examples of transverse waves?

Answer 16

Electromagnetic waves
Ripples in water

Question 17

What are some examples of longitudinal waves?

Answer 17

Sound waves
Ultra spund

Question 18

How do you calculate wave speed?

Answer 18

Wave speed = frequency x wave length

Question 19

What are the three things that can happen when a wave arrives at a boundary between two different materials?

Answer 19

They can he absorbed, transmitted or reflected

Question 20

What happens a wave is absorbed by a material?

Answer 20

The energy from the wave transfers into the material energy stores

Question 21

What happens when a wave is transmitted through a material?

Answer 21

The wave carries on travelling through the new material which leads to refraction

Question 22

What is the “angle of incidence”

Answer 22

The angle between the incoming wave and the normal

Question 23

What is the angle of reflection?

Answer 23

The angle between the reflected wave and the normal

Question 24

What are the two different ways waves can be reflected at different boundaries?

Answer 24

Specular reflection
Diffuse reflection

Question 25

When does specular reflection happen?

Answer 25

When a wave is reflected in a single direction by a smooth surface

Question 26

When does diffuse reflection happen?

Answer 26

When a wave is reflected by a rough surface and the rays are scattered in different directions

Question 27

What is refraction?

Answer 27

When waves change direction at a boundary

Question 28

What changes when a wave is refracted and what stays the same?

Answer 28

The wave length changes and the frequency dtays the same

Question 29

If a straight light ray at no angle meets glass, what will happen?

Answer 29

Light wave will continue could will slow down

Question 30

What happens when a light ray hits a more dense medium like glass at an angle?

Answer 30

It will be refracted (direction will change) and be closer to the medium

Question 31

What will happen to an angled light ray if it goes from a more dense medium to a less dense medium (like glass to air)?

Answer 31

The light ray will be refracted (direction change) and be further away from the normal

Question 32

What is ultrasound?

Answer 32

Sound with frequencies higher than 20,000 Hz

Question 33

What type of reflection occurs with ultrasound?

Answer 33

Partial reflection

Question 34

What happens when ultrasound is partially reflected?

Answer 34

Some of the ultra sound wave is reflected and some is refracted

Question 35

How does Ultra sound work when scanning babies

Answer 35

The ultrasound passes through the body but when they reach a boundary between two different mediums some wave is reflected back, creating an image

Question 36

What is used to detect seismic waves?

Answer 36

Seismometers

Question 37

What produces seismic waves?

Answer 37

Eathquakes volcanoes and explosions

Question 38

What are the two different types of seismic waves?

Answer 38

P-waves and S-waves

Question 39

What are P-Waves like?

Answer 39

They are longitudinal waves that can travel through soilds and liquids and are faster than S-waves

Question 40

What are S-waves like?

Answer 40

They are transverse waves and can only travel through solids

Question 41

What three things can happen to seismic waves (only P-waves) when they meet the boundary between the mantle and the liquid outer core?

Answer 41

They can be Relfected, Absorbed or Refracted

Question 42

Why is there a sudden change in the direction of P-waves when they meet the boundary between the mantle and the liquid outer core?

Answer 42

The mantle and liquid outer core arent all the same density so they refract

Question 43

Why cant S-waves get to the liquid outer core?

Answer 43

S-waves cant travel through liquids

Question 44

A red filter is placed in front of a spotlight. The Spotlight is directed at a blue object. Explain why the blue object appears black?

Answer 44

Since red is covering the light, only red is transmitted by the filter so it will be absorbed by the blue object This means no light csn be reflected by the object and it will appear black