Chapter 2 7N1 Flashcards Preview

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Flashcards in Chapter 2 7N1 Deck (31):
1

Refraction

The bending of light waves when slowing down, entering a denser medium.

2

Angle of refraction

The angle which is created by light rays when they refract (change direction).

3

Reflected ray

The light ray which is reflected back from the incidence ray at the same angle.

4

Incident ray

The light ray which is coming from a source (e.g., the Sun).

5

Medium

A substance which can affect a ray's movement by refracting or reflecting it.

6

Law of Reflection

The angle of incidence and the angle of reflection are equal.

7

Diffuse scattering

When light rays reflect from a rough surface.

8

Specular reflection

When light rays reflect from a smooth surface.

9

Peak/crest/trough

The extension of a wave.

10

Wave

A source which holds energy (it doesn't hold matter).

11

Spectrum

Colours which come (as light rays) from a prism and come out as colours.

12

Dispersion

The splitting up of a light ray due to refraction.

13

Concave lens

Makes light move closer to each other in a shorter distance.

14

Convex lens

Makes light move further from each other but still touch.

15

Retina

A layer of cells at the back of the eye for light to refract towards.

16

Lens

A device used to adjust light rays into touching at the retina.

17

Cornea

The layer at the front of the eye which is transparent.

18

Speed of sound

The distance that sound waves travel (340m/s).

19

Audible range

The range of frequency humans can hear (20Hz-20,000Hz).

20

Vacuum

A space with no solid, liquid and gas particles/matter.

21

Ultrasound

PA sound higher than the audible range.

22

Echo

Sound waves reflecting from a hard, smooth object.

23

Reverberation

A sound going on for a longer period than normal.

24

Pitch

How sound is heard with frequency.

25

Oscillation

When something moves back and forth

26

Amplitude

The distance/extension of a wave.

27

Frequency

The speed of sound waves heard per second.

28

Wavelength

The distance between two points of waves.

29

Transverse wave

Waves when the waves are perpendicular to the medium.

30

Longitudinal wave

Waves when the vibration and the direction it moves in are in the same direction.

31

Speed of light

The distance sound travels in one second.