Waves and reflection general knowledge Flashcards Preview

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Flashcards in Waves and reflection general knowledge Deck (33)
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1

A pulse

A single disturbance that is propagated through a medium which has an amplitude and pulse length

2

Amplitude

The distance from the equilibrium position to the highest displacement point (crest or trough)

3

Equilibrium position

The position at which the medium is at rest

4

Transverse pulse

A pulse in which the particles of the medium travel in right angles to the propagation direction of the pulse

5

Interference

The phenomena that occurs when two pulses meet as they move through the same medium

6

Constructive interference

Occurs when pulses overlap and the resultant displacement of the medium increases at the point of overlap

7

Destructive interference

Occurs when pulses with displacements in opposite directions overlap and the resultant displacement of the medium decreases at the point of overlap

8

A medium

The material through which a pulse or wave is propagated

9

Equilibrium position

The starting point of the wave, when no disturbance is present.

10

Wavelength
(Lambda)

The straight line distance between two adjacent points on a wave that are in phase.

11

Crest and Trough

Highest and lowest (Greatest points on both sides of the equilibrium position) point of the waves displacement.

12

Frequency (f)

The number of wave crests or troughs that pass a certain point (observer) in a second.
Hz= s^-1
f=1/T

13

Period (T)

The time taken for a wave to pass a certain point
Seconds= s
T=1/f

14

What is the wavelength range of visible light?

~400 nm- ~700 nm
Red= ~700 nm
Violet= ~400 nm

15

The wavelength range of Gamma rays

10^-2 nm to 10^-6 nm
(=1 Angstrom)

16

The wavelength range of x- rays

10^-1 nm - 10 nm

17

The wavelength range of ultraviolet light

100 nm - 10^3 nm
(=1 micrometer)

18

The wavelength range of infrared light

10 micrometers - 1 mm

19

The wavelength range of microwaves

1 cm - 1 m

20

The wave length range of radio waves

10 m - 100 Mm

21

What is the law of reflection?

The angle of incidence is equal to the angle of refraction

22

Properties of images formed in plane mirrors

Real image:
1. Can be projected onto a screen
2. Light rays pass through the image
3. Usually inverted

Virtual image:
1. Cannot be projected onto a screen
2. No light rays pass through the image
3. Always upright

23

What is diffuse reflection?

1. Light reflected off rough surfaces
2. Results in scattered rays which give a blurred image.

24

What is specular reflection?

1. Light reflected off smooth surfaces
2. Results in clear, sharp image

25

Multiple reflection equation

(360/ the angle between the mirror)-1

26

What would happen if two plane mirrors are placed parallel to one another?

An infinite number of images will be formed

27

Label the 10 variables involved with curved mirrors

F= focal point
I= image size
P= pole of axis
R= radius of curvature
f= focal length
O= object size
u= image distance
v= image distance
C= centre of curvature
M= magnification

28

What is LOST?

L- Location
O- orientation
S- size
T- type

29

Real image

1. Can be projected onto a screen
2. Light rays pass through the image

30

Virtual image

1. Cannot be projected onto a screen
2. No light rays pass through the image