P12 - Wave Properties

Question 1

What are the 2 types of waves?

Answer 1

transverse & longitudinal

Question 2

Define wave.

Answer 2

way of trnsfrrng energy wtht trnsfrrng matter

Question 3

In all waves, what way in what direction is energy transferred?

Answer 3

left -> right

Question 4

In a transverse wave, what direction do the particles travel?

Answer 4

up & down - perpendicular to direction of energy trnsfrrd

Question 5

Give an example of a transverse wave.

Answer 5

(surface water) wave

Question 6

Define wavelength in a transverse wave.

Answer 6

distance from peak -> peak

Question 7

What is an oscillation?

Answer 7

wave moving up & down

Question 8

Define the amplitude of a transverse wave.

Answer 8

max dsplcmnt of wave’s point -> rest postion.

Question 9

In a longitudinal wave, what direction do the particles travel?

Answer 9

left -> right - parallel to direction energy trnsfrrd

Question 10

What is it called where a part of a longitudinal wave squashes together?

Answer 10

compression

Question 11

What is it called where a part of a longitudinal wave is spread out?

Answer 11

rarefraction

Question 12

Define wavelength in a longitudinal wave.

Answer 12

distance from compression -> compression

Question 13

What is frequency?

Answer 13

number of waves that pass point each second

Question 14

What is the equation for speed of sound?

Answer 14

distance btwn mcphns/ time on cmptr

Question 15

Give an example of a longitudinal wave.

Answer 15

sound

Question 16

What type of wave requires a medium to travel through?

Answer 16

longitudinal

Question 17

In both tranverse or longitudinal wave, what travels, the wave or the matter?

Answer 17

wave

Question 18

What is the period of a wave?

Answer 18

time(s) for 1 wave to pass point

Question 19

When waves travel from one medium to another, what changes? What doesn’t change?

Answer 19

speed & wavelength changes, not frequency

Question 20

Define reflection.

Answer 20

waves bounce back

Question 21

Define refraction.

Answer 21

waves change speed & direction as they cross boundary

Question 22

In a wave front diagram, when a wave crosses an ordinary boundary what happens?

Answer 22

wave slows down at same speed

Question 23

In a wave front diagram, when a wave crossses a boundary at an angle what happens?

Answer 23

1 end of wave front changes speed before other end -> wave changes direction

Question 24

Do waves travel faster or slower in deep water?

Answer 24

faster

Question 25

Do waves travel faster or slower in shallow water?

Answer 25

slower

Question 26

What is the rule on filters & colours?

Answer 26

filters transmit their own colours

Question 27

What is the rule of objects & colours?

Answer 27

objects reflect their own colours

Question 28

What colours make cyan?

Answer 28

blue & green

Question 29

What colours make magenta?

Answer 29

blue & red

Question 30

What colours make yellow?

Answer 30

green & red

Question 31

How do you recognise a real image?

Answer 31

projected onto screen

Question 32

How do you recognise a virtual image?

Answer 32

comes behind lens

Question 33

What type of lenses are always virtual?

Answer 33

concave

Question 34

How do you recognise a magnified image?

Answer 34

image > object

Question 35

How do you recognise a diminished image?

Answer 35

image < object

Question 36

How do you recognise an inverted image?

Answer 36

upside down compared to object

Question 37

What is the symbol for a concave lens?

Answer 37

upside down arrowheads

Question 38

How do you represent a virtual image?

Answer 38

dotted lines

Question 39

What happens to ultrasound waves when they meet a boundary between 2 different materials?

Answer 39

some reflected, some absorbed & some transmttd

Question 40

How do x rays produce an image of bones?

Answer 40

- x rays absorbed by bones - x rays go through other tissues - so neg. image of where x rays blocked = recdd on computer

Question 41

What is refraction caused by?

Answer 41

change in speed when density changes