# Waves Definitions

5.0 / 5 based on 1 rating

- Created by: chalky-nerd
- Created on: 07-07-20 10:12

Mechanical waves

Waves which require a medium to travel through

1 of 42

Electromagnetic waves

Waves which do not require a medium to travel through

2 of 42

Transverse wave

A wave that consists of particles which oscillate perpendicular to the direction of the propagation of the wave

3 of 42

Longitudinal wave

A wave that consists of particles which oscillate parallel to the direction of the propagation of the wave

4 of 42

Compression

Area of maximum pressure in a longitudinal wave

5 of 42

Rarefaction

Area of minimal pressure in a longitudinal wave

6 of 42

Amplitude, A

Maximum displacement of particles from their mean position, metres

7 of 42

Period, T

Time taken for one complete oscillation to occur, seconds

8 of 42

Frequency, f

Number of oscillations per second, hertz

9 of 42

Wavelength, λ

Distance between corresponding points on successive oscillations of a wave, metres

10 of 42

Wavefront

A line joining all points in a medium where the waves are in phase

11 of 42

Phase

Refers to the position within a cycle that the particle occupies relative to the onset of the cycle

12 of 42

Superposition

When multiple waves of the same type meet at a point, the resultant displacement of the oscillations will be the vector sum of the individual displacements

13 of 42

Interference

When two sources of waves cause a pattern of maxima and minima

14 of 42

Path difference

Difference in distance from each source to a particular point

15 of 42

Constructive superposition

When path difference is 0 or a integer number of wavelengths

16 of 42

Coherent sources

Same frequency and wavelength and maintain a constant phase relationship

17 of 42

Standing waves

Created by the superposition of two progressive waves of equal frequency and amplitude moving in opposite directions

18 of 42

Node

Point of 0 amplitude on a standing wave

19 of 42

Antinode

Point of maximum amplitude on a standing wave

20 of 42

Fundamental frequency

Frequency at which a standing wave is formed with one antinode

21 of 42

Overtones

Notes emitted by vibrations other than the fundamental frequency

22 of 42

Harmonics

Overtones which have an integer multiples of the fundamental frequency

23 of 42

Diffraction

When a wave passes through a gap or partially obstructed by a barrier, the wavefront spreads out into the shadow region

24 of 42

Huygens' construction

Every point on the wavefront considered as a source of secondary wavelets which spread out with wave velocity; the new wavefront is the superposition of the wavelets

25 of 42

Plane polarised waves

Transverse waves in which the oscillations occur in a single plane

26 of 42

Pulse echo techniques

Sonar, radar, ultrasound

27 of 42

Ultrasound

Pulses sent into body and bounce back when there is a change in density (tissue); reflections detected; computer generates an image

28 of 42

Limitations of pulse echo techniques

Pulse must be emitted for a short time otherwise the detector may confuse the emitted and received pulses

29 of 42

Refraction

Change in direction of a ray of light passing from one medium to another at an angle

30 of 42

Law of reflection

Angle of incidence is equal to the angle of reflection

31 of 42

Refractive index

Ratio of the speed in medium 1 to speed in medium 2

32 of 42

Critical angle

Angle of incidence which causes refraction at 90°, above which total internal reflection occurs

33 of 42

Critical angle equation

Sin C = 1/n

34 of 42

Focal point

Point where parallel rays of light meet or appear to diverge from

35 of 42

Converging lens

Forms a real image where the light rays meet

36 of 42

Diverging lens

Forms a virtual image where no rays intersect

37 of 42

Power of a lens

Refers to the ability of the lens to deviate rays of light through large angles, measured in dioptres

38 of 42

Focal length

Distance between optical centre of lens and focal point

39 of 42

u

Object distance

40 of 42

v

Image distance

41 of 42

f

Focal length

42 of 42

## Other cards in this set

### Card 2

#### Front

Waves which do not require a medium to travel through

#### Back

Electromagnetic waves

### Card 3

#### Front

A wave that consists of particles which oscillate perpendicular to the direction of the propagation of the wave

#### Back

### Card 4

#### Front

A wave that consists of particles which oscillate parallel to the direction of the propagation of the wave

#### Back

### Card 5

#### Front

Area of maximum pressure in a longitudinal wave

#### Back

## Related discussions on The Student Room

## Similar Physics resources:

0.0 / 5

3.0 / 5 based on 1 rating

0.0 / 5

0.0 / 5

0.0 / 5

0.0 / 5

3.0 / 5 based on 2 ratings

0.0 / 5

## Comments

No comments have yet been made