Waves

Question 1

What do waves transfer?

Answer 1

Energy without transferring matter

Question 2

What are the 2 types of waves?

Answer 2

Transfers and longitudinal

Question 3

What are transverse waves?

Answer 3

Oscillations are perpendicular to the direction of travel and energy transfer

Question 4

Examples of transverse waves

Answer 4

Radio, microwave, light

Question 5

What are longitudinal waves?

Answer 5

Oscillations are parallel to the direction ration of travel and energy transfer

Question 6

What do longitudinal waves have that transverse waves don’t?

Answer 6

Compressions and rare fractions

Question 7

Examples of longitudinal waves

Answer 7

Sound, compression

Question 8

What is wavelength?

Answer 8

Length of 1 complete wave

Question 9

What is amplitude?

Answer 9

Maximum displacement between from equilibrium

Question 10

What is frequency?

Answer 10

Number of complete waves per second

Question 11

What is a period?

Answer 11

Time taken for a whole wave to completely pass a single point

Question 12

What is a wavefront?

Answer 12

The plane in which the wave travels (ie. The direction of the wave)

Question 13

Velocity Equation:

Answer 13

Velocity = frequency x wavelength

Question 14

What is frequency measured in?

Answer 14

Hertz

Question 15

What is wavelength measured in?

Answer 15

Metres

Question 16

Wave speed equation:

Answer 16

Wave speed= frequency x wavelength

Question 17

What happens if you increase frequency?

Answer 17

Velocity increased

Question 18

What happens if you increase wavelength?

Answer 18

Velocity increases

Question 19

What is the relationship between period and frequency?

Answer 19

Period is inversely proportional to frequency

Question 20

What happens if it’s a smaller period?

Answer 20

Higher frequency and greater velocity

Question 21

What is the speed of sound in air?

Answer 21

330m/s

Question 22

How can we use echo to measure sound?

Answer 22

Allows us to measure sound over a greater distance

Question 23

What do you need to take into account when using echo to measure sound?

Answer 23

Double the distance as echo is there and back
Or half the time as echo takes time to go there and back

Question 24

What can we use to investigate wave speed?

Answer 24

Ripple tank

Question 25

When light meets a boundary, what 3 things can happen?

Answer 25

1. Reflection
2. Transmission
3. Absorption

Question 26

What does it mean when a light wave is reflected?

Answer 26

The waves bounce off the material

Question 27

What does it mean when a light wave is transmitted?

Answer 27

The waves passes through the material

Question 28

What does it mean when a light wave is absorbed?

Answer 28

Energy is transferred to the material

Question 29

What is the Law Of Reflection?

Answer 29

Angle of incidence = the angle of reflection

Question 30

What does the Law Of Reflection mean?

Answer 30

That wave speed, wave length and frequency DON’T change

Question 31

Reflection practical: How can we improve the experiment and why do we need to?

Answer 31

Human error when drawing the dots and crosses (which indicate the light ray) as the line is quick thick. This makes it hard to judge the centre of the ray.
To improve, use a laser light or smaller slit to make the ray thinner and easier to draw.

Question 32

What is refraction?

Answer 32

When waves change speed at the interface between materials

Question 33

When light goes from air to glass its direction…
This is because…
As a result, it’s speed….. bending the wave ……… the normal.

Answer 33

Moves towards the normal
As it moves from a less dense to a more dense material
Decreases
Towards

Question 34

When light goes from glass to air its direction…
This is because…
As a result, it’s speed….. bending the wave ……… the normal.

Answer 34

Moves away from the normal
As it moves from a more dense to a less dense material
Increases
Away from

Question 35

When light enters the air or glass along the normal, what happens?

Answer 35

Nothing changes