Wave Properties

Question 1

all waves transfer ….. not …..

Answer 1

all waves transfer energy not matter

Question 2

describe how your teacher produced a longitudinal wave by using a linky spring

Answer 2

he pushed the slinky into itself and the vibration were parallel to the direction of energy transfer

Question 3

longitudinal waves are produced when the vibrations are …… to the direction of energy

Answer 3

longitudinal waves are produced when the vibrations are parallel to the direction of energy

Question 4

label this diagram

Answer 4

Question 5

describe the motion of one loops as he wave travels along the slinky

Answer 5

each loop/particle ossilates/vibrates on the spot transferring energy rather than matter

Question 6

transverse waves are produced when the vibrations are …… to the direction of energy

Answer 6

transverse waves are produced when the vibrations are perpendicular to the direction of energy

Question 7

describe how your teacher produced a transverse wave

Answer 7

he moved the slinky to the left to the right to the left

Question 8

label this diagram

Answer 8

Question 9

in microwaves, waves interefere with other waves. what does this set up?

Answer 9

a standing wave

Question 10

in a microwave, an area where waves interefer constructively and there is lots of energy is called what?

Answer 10

an antinode

Question 11

in a microwave, an area where waves interfere destructively and there is no of energy is called what?

Answer 11

node

Question 12

convert 2500 MHz into Hz

Answer 12

25, 000,000, 00

Question 13

what is the wave equation?

Answer 13

wave speed = frequency x wavelength

m/s = Hz x m

v = fλ

Question 14

rearrange the wave equation so that frequency is the subject

Answer 14

frequency = wave speed ÷ wavelength

Hz = m/s ÷ m

f= v ÷ λ

Question 15

rearrange the wave equation so that wavelength is the subject

Answer 15

wavelength = wave speed ÷ frequency

m = m/s ÷ Hz

λ = v ÷ f

Question 16

given that the Hz is 25,000,000,00 and the wavelength is 0.12, calculate the speed of light

Answer 16

wave speed = frequency x wavelength

= 25,000,000,00 x 0.12

= 3, 000, 000, 00

= 3 x 10⁸ m/s

Question 17

if the time for 2 waves = 4 seconds, calculate the frequency

Answer 17

2 waves = 4 secs

0.5 = 1 second

Question 18

if the time for 2 waves = 0.5 seconds, calculate the frequancy

Answer 18

2 waves = 0.5 secs

4 waves = 1 sec

Question 19

if the speed of sound in air is 340 m/s and the frequency is 3500Hz, what is the wavelength?

Answer 19

λ = v ÷ f

= 340 ÷ 3500

= 0.1m (1 d.p)

Question 20

the range of frequencies a bat can produce is 20 kHz - 80 kHz and the speed of air is 340 m/s. Calculate the longest wavelength bats can produce

Answer 20

λ = v ÷ f

340 ÷ 20,000

=0.017m

Question 21

the range of frequencies a bat can produce is 20 kHz - 80 kHz and the speed of air is 340 m/s. Calculate the shortest wavelength bats can produce

Answer 21

λ = v ÷ f

= 340 ÷ 80,000

= 4.2 x 10³

= 0.0042m

Question 22

convert 20kHz into Hz

Answer 22

20,000Hz

Question 23

convert 80kHz into Hz

Answer 23

80,000Hz

Question 24

what is the Time Period

Answer 24

the time it takes for one wave to be produced in sesonds (s)

Question 25

what equation relates Time Period (T) and frequency (f)?

Answer 25

frequency = 1 ÷ time period time period = 1 ÷ frequency

Question 26

the height of the wave is related to the ..... of sound the greater the amplitude the ..... the sound the ...... is the height of the wave from the undisturbed or equilibrium position

Answer 26

the height of the wave is related to the **volume** of sound the greater the amplitude the **louder** the sound the **amplitude** is the height of the wave from the undisturbed or equilibrium position

Question 27

the number of waves produced is related to the ... or ... the more waves produced per second the greater the ... or ...

Answer 27

the number of waves produced is related to the **pitch** or **frequency** the more waves produced per second the greater the **pitch** or **frequency**

Question 28

a girls stands on the beach watching the waves break onto the shore she counts 10 waves in 90 seconds how long does it take for 1 wave to break onto the shore?

Answer 28

time period T = 1 ÷ f = 1 / 10÷90 = 9 secs

Question 29

a girls stands on the beach watching the waves break onto the shore she counts 10 waves in 90 seconds how many waves break onto the shore in 1 second

Answer 29

frequency f = 1 ÷ t = 1 ÷ 9 = 0.11 Hz

Question 30

a mother waves her child off to school and sheds a tear every five seconds and completes a wave every 0.5 seconds calculate the frequency of the tears

Answer 30

1 tear ÷ 5 secs 1 tear ÷ 5 = 0.2 = 0.2 Hz

Question 31

a mother waves her child off to school and sheds a tear every five seconds and completes a wave every 0.5 seconds calculate the frequency of the waves

Answer 31

1 wave ÷ 0.5 1 wave x 2 = 2 = 2 Hz

Question 32

is this one wave or two?

Answer 32

one

Question 33

given that the frequencey is 30 and the wavelength is 70.5, what is the wave speed?

Answer 33

v = fλ = 30 x 70.5 = 2115

Question 34

given that the frequencey is 40 and the wavelength is 51, what is the wave speed?

Answer 34

v = fλ = 40 x 51 = 2040

Question 35

why is it better to count 10 oscillations in an experimet rather than 1 and repeat readings?

Answer 35

the reliability of the experiment increases decreases the possibility of human error you reaction time becomes a smaller proportion to the total time you are measuring so you become more certain of the total time

Question 36

given that the frequencey is 868 and the wavelength is 0.33, what is the speed of sound?

Answer 36

v = fλ = 686 x 0.33 = 226.38 m/s

Question 37

when does diffraction occur?

Answer 37

when waves interact with a gap or object

Question 38

what is diffraction?

Answer 38

it is the spreading out of wave and depends on the size of the gap relative to the wavelength

Question 39

what happens to diffraction when wavelength gets greater?

Answer 39

the greater the wavelength the greater the diffraction

Question 40

what does diffraction look like when the wavelngth is approximately the same size as the gap width

Answer 40

Question 41

what does diffraction look like when the wavelngth is smaller thanthe gap width

Answer 41

Question 42

what is the relationship between frequency and wavelength?

Answer 42

the higher the frequency the shorter the wavelength

Question 43

The narrower, or the longer the wavelength, the **more/less** the wave spreads out

Answer 43

The narrower, or the longer the wavelength, the **more** the wave spreads out

Question 44

What three things can all was be?

Answer 44

all waves can be reflected, refracted and diffracted