Wave Properties Flashcards
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 108 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 103
= 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
