Section A - Optics

Question 1

what is Amplitude?

Answer 1

Maximum value of a wave

Question 2

What is Frequency? Symbol?

Answer 2

The number of complete waves per second & symbol=f

Question 3

What units is frequency in? and Symbol?

Answer 3

Hertz and Hz

Question 4

What is velocity? and Symbol?

Answer 4

Speed in a given direction and symbol = v

Question 5

What units is velocity in? and Symbol?

Answer 5

Meters per second = Ms-1

Question 6

What is Wavelength? Symbol?

Answer 6

The distance between successive crests or troughs an symbol= |\

Question 7

What units is Wavelength in? and Symbol?

Answer 7

Nano meters and nm or m-9

Question 8

What is the equation to find out wavelength and symbol

Answer 8

V / f= W m-9

Question 9

What is the equation to find out velocity and symbol

Answer 9

f x |\ = Velocity Ms-1

Question 10

What is the equation to find out frequency

Answer 10

v / |\ = f Hz

Question 11

What does the triangle look like for v, f and |\

Answer 11

V on top as lowest number

Question 12

what is meant by a wave front?

Answer 12

a surface containing points affected in the same way by a wave at a given time.

Question 13

What measurement does a wave travel in a vacuum

Answer 13

3 x 10(8) ms-1

Question 14

What direction does light travel in?

Answer 14

left to right

Question 15

About the electromagnetic Vibrations

Answer 15

they are transverse (90 degrees) to the direction of travel

Question 16

What is the electro magnetic spectrum?

Answer 16

Radio, Micro, infrared, Visible, ultravoilet, x-rays, gamma,
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Question 17

How to remember the visible spectrum numbers

Answer 17

start from the top at 775 - goes down
150
25
25
75
50
50

Question 18

What is the visible light pattern

Answer 18

red, orange, yellow, green, blue voilet

Question 19

Longlitudal wave

Answer 19

Consists of compressions
can travel through any material
change in density throughout medium
e.g. sound waves

Question 20

Transverse waves

Answer 20

Consitis of troughs and crest
Cannot travel through gas
vibrate in a right angle to the difrection of the wave
no change in density throughout medium
e.g. ripples of water surface

Question 21

Vergence

Answer 21

describes the curvature of a wavefront in Dioptres (D)

Question 22

Curvature of wavefront

Answer 22

distance from the source to the current position of the wavefront = 1/r (m) and 100/r (cm) etc

Question 23

Distance between distance and displacement time

Answer 23

Distance time graph will only every increase it never drops

Question 24

Huygens Construction theory

Answer 24

Ecer point of a wave front is a source to a secondary wavelet

Question 25

Continous wave

Answer 25

goes on forever in same direction

Question 26

wave pulse

Answer 26

like a heart beat, a single disturbance that passes through a medium

Question 27

State 4 properties of a pinhole camera image

Answer 27

Image size can be predicted using similar triangles
inverted
free from distortion
image size can be increased when camera length is increased, however image is not as bright

Question 28

What needs to be done when an aperture is present on a pinhole camera

Answer 28

draw 4 lines

Question 29

What is an umbra

Answer 29

Umbra is well defined and full shadow

Question 30

What is a penumbra

Answer 30

Partial shadow

Question 31

What does it mean when it says state the nature of a shadow

Answer 31

Shape?
type of shadow?
Area of shadow?
Size of shadow?

Question 32

What is the equation to work out position on umbra

Answer 32

x = Lxh / s-h