all waves transfer ..... not .....

all waves transfer **energy** not **matter**

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

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

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

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

label this diagram

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

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

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

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

describe how your teacher produced a transverse wave

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

label this diagram

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

a standing wave

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

an antinode

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

node

convert 2500 MHz into Hz

25, 000,000, 00

what is the wave equation?

wave speed = frequency x wavelength

m/s = Hz x m

v = fλ

rearrange the wave equation so that frequency is the subject

frequency = wave speed ÷ wavelength

Hz = m/s ÷ m

f= v ÷ λ

rearrange the wave equation so that wavelength is the subject

wavelength = wave speed ÷ frequency

m = m/s ÷ Hz

λ = v ÷ f

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

wave speed = frequency x wavelength

= 25,000,000,00 x 0.12

= 3, 000, 000, 00

= 3 x 10^{8} m/s

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

2 waves = 4 secs

0.5 = 1 second

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

2 waves = 0.5 secs

4 waves = 1 sec

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

λ = v ÷ f

= 340 ÷ 3500

= 0.1m (1 d.p)

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

λ = v ÷ f

340 ÷ 20,000

=0.017m

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

λ = v ÷ f

= 340 ÷ 80,000

= 4.2 x 10^{3}

= 0.0042m

convert 20kHz into Hz

20,000Hz

convert 80kHz into Hz

80,000Hz

what is the Time Period

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

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

frequency = 1 ÷ time period

time period = 1 ÷ frequency

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

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

the number of waves produced is related to the ... or ...

the more waves produced per second the greater the ... or ...

the number of waves produced is related to the** pitch** or **frequency**

the more waves produced per second the greater the **pitch** or **frequency**

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?

time period

T = 1 ÷ f

= 1 / 10÷90

= 9 secs

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

frequency

f = 1 ÷ t

= 1 ÷ 9

= 0.11 Hz

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

1 tear ÷ 5 secs

1 tear ÷ 5 = 0.2

= 0.2 Hz

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

1 wave ÷ 0.5

1 wave x 2 = 2

= 2 Hz

is this one wave or two?

one

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

v = fλ

= 30 x 70.5

= 2115

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

v = fλ

= 40 x 51

= 2040

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

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

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

v = fλ

= 686 x 0.33

= 226.38 m/s

when does diffraction occur?

when waves interact with a gap or object

what is diffraction?

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

what happens to diffraction when wavelength gets greater?

the greater the wavelength the greater the diffraction

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

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

what is the relationship between frequency and wavelength?

the higher the frequency the shorter the wavelength

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

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

What three things can all was be?

all waves can be reflected, refracted and diffracted