(K) Unit 22 Waves

0.0(0)
studied byStudied by 0 people
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
Card Sorting

1/39

encourage image

There's no tags or description

Looks like no tags are added yet.

Study Analytics
Name
Mastery
Learn
Test
Matching
Spaced

No study sessions yet.

40 Terms

1
New cards

Angle of incidence

Angle between the normal and the incident ray

2
New cards

Angle of reflection

The angle between the reflected ray and the normal (the imaginary line drawn at 90 degrees to the reflecting surface).

3
New cards

Critical angle

The minimum angle at which total internal reflection takes place.

4
New cards

Density

Is the ratio of mass to volume. It is usually measured in kilograms per metre cubed (kg/m3 ) or grams per centimetre cubed (g/cm3 ).

5
New cards

Diffuse reflection

When light is reflected off a surface and is scattered in different directions.

6
New cards

Dispersion

Spreading out of the different wavelengths of light, caused by refraction of light as it passes through a prism.

7
New cards

Electromagnetic wave

A transverse wave propagated by variations (oscillations) of electric and magnetic field strengths.

8
New cards

Electromagnetic spectrum

Range of all possible frequencies of electromagnetic radiation, e.g. ultraviolet light is part of the EM spectrum.

9
New cards

Frequency

The number of waves produced each second. The unit of frequency is hertz (Hz)

10
New cards

Incident ray

Light ray moving towards a surface or boundary.

11
New cards

Ionising radiation

Radiation that is able to remove electrons from atoms or molecules to produce positively charged particles called ions.

12
New cards

Law of reflection

In reflection at a surface, the angle of incidence equals the angle of reflection.

13
New cards

Lens

A transparent tool that can change the direction of a ray of light.

14
New cards

Longitudinal wave

A wave that moves in the same direction as the direction in which the particles are vibrating

15
New cards

Matter

Sub-atomic particles and anything made from them, such as atoms and molecules, are matter. Energy and forces are not matter.

16
New cards

Medium

A material through which a wave can be transmitted (propagate).

17
New cards

Normal

A line that is drawn at an angle of 90° to a surface or boundary.

18
New cards

Opaque

Not transparent or see-through.

19
New cards

Optical fibre

A fine glass fibre, through which light travels by total internal reflection, from one end to the other.

20
New cards

Oscillations

The repeated and regular fluctuations, above and below the same position, eg the pressure of a sound wave or the voltage of an alternating current.

21
New cards

Plane

A flat, two-dimensional surface.

22
New cards

Ray diagram

Diagram that represents the direction and angle of travel of light.

23
New cards

Radiation

Energy transferred as a wave spreading out from a source - eg light, infrared, sound.

24
New cards

Reflected ray

Is the ray that represents the light reflected by a surface (or boundary).

25
New cards

Refracted

A ray (wave) that changes speed and direction when it enters a medium of different density

26
New cards

Refraction

Process by which a wave changes speed and sometimes direction upon entering a denser or less dense medium, e.g. a light ray changes direction when refracted by a glass block.

27
New cards

Retina

The light-sensitive area on the back of the eye. Light must be focused on the retina in order to see clearly.

28
New cards

Specular reflection

Reflection in which light travelling towards a surface in one direction is all reflected in a single direction.

29
New cards

Spectrum

A series of similar waves arranged in order of wavelength or frequency.

30
New cards

Translucent

Allows light to pass through but is not completely clear.

31
New cards

Transparent

Able to be seen through

32
New cards

Transverse (motu hake)

At 90 degrees. In transverse waves, the vibrations are at 90 degrees to the direction in which the waves travel.

33
New cards

Transverse wave

A wave that moves in a direction at right angles to the way in which the particles are vibrating.

34
New cards

Total internal reflection (whakaata a-roto)

Complete reflection of a light ray reaching a boundary at an angle of incidence greater than the critical angle.

35
New cards

Transmitted (tare)

A wave is passed across or through a material (medium), e.g. light waves are transmitted through air, glass and water.

36
New cards

Vacuum (korehau)

A volume that contains no matter.

37
New cards

Vibrations (ngatere)

Repeated movements back and forth (about a fixed point).

38
New cards

Virtual image (mātātuhi mariko)

An image from which rays of light appear to come but do not do so in reality.

39
New cards

Waves (karekare)

Vibrations that transfer energy from place to place without the transference of matter.

40
New cards

Wavelength (roangaru)

The length of a single wave, measured from one wave peak to the next