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Physics > Wave Properties > Flashcards

Wave Properties Flashcards

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1
Q

all waves transfer ….. not …..

A

all waves transfer energy not matter

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2
Q

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

A

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

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3
Q

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

A

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

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4
Q

label this diagram

A
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5
Q

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

A

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

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6
Q

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

A

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

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7
Q

describe how your teacher produced a transverse wave

A

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

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8
Q

label this diagram

A
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9
Q

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

A

a standing wave

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10
Q

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

A

an antinode

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11
Q

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

A

node

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12
Q

convert 2500 MHz into Hz

A

25, 000,000, 00

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13
Q

what is the wave equation?

A

wave speed = frequency x wavelength

m/s = Hz x m

v = fλ

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14
Q

rearrange the wave equation so that frequency is the subject

A

frequency = wave speed ÷ wavelength

Hz = m/s ÷ m

f= v ÷ λ

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15
Q

rearrange the wave equation so that wavelength is the subject

A

wavelength = wave speed ÷ frequency

m = m/s ÷ Hz

λ = v ÷ f

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16
Q

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

A

wave speed = frequency x wavelength

= 25,000,000,00 x 0.12

= 3, 000, 000, 00

= 3 x 108 m/s

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17
Q

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

A

2 waves = 4 secs

0.5 = 1 second

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18
Q

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

A

2 waves = 0.5 secs

4 waves = 1 sec

19
Q

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

A

λ = v ÷ f

= 340 ÷ 3500

= 0.1m (1 d.p)

20
Q

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

A

λ = v ÷ f

340 ÷ 20,000

=0.017m

21
Q

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

A

λ = v ÷ f

= 340 ÷ 80,000

= 4.2 x 103

= 0.0042m

22
Q

convert 20kHz into Hz

A

20,000Hz

23
Q

convert 80kHz into Hz

A

80,000Hz

24
Q

what is the Time Period

A

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

25
Q

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

A

frequency = 1 ÷ time period

time period = 1 ÷ frequency

26
Q

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

A

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

27
Q

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

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

A

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

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

28
Q

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?

A

time period

T = 1 ÷ f

= 1 / 10÷90

= 9 secs

29
Q

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

A

frequency

f = 1 ÷ t

= 1 ÷ 9

= 0.11 Hz

30
Q

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

A

1 tear ÷ 5 secs

1 tear ÷ 5 = 0.2

= 0.2 Hz

31
Q

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

A

1 wave ÷ 0.5

1 wave x 2 = 2

= 2 Hz

32
Q

is this one wave or two?

A

one

33
Q

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

A

v = fλ

= 30 x 70.5

= 2115

34
Q

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

A

v = fλ

= 40 x 51

= 2040

35
Q

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

A

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

36
Q

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

A

v = fλ

= 686 x 0.33

= 226.38 m/s

37
Q

when does diffraction occur?

A

when waves interact with a gap or object

38
Q

what is diffraction?

A

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

39
Q

what happens to diffraction when wavelength gets greater?

A

the greater the wavelength the greater the diffraction

40
Q

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

A
41
Q

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

A
42
Q

what is the relationship between frequency and wavelength?

A

the higher the frequency the shorter the wavelength

43
Q

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

A

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

44
Q

What three things can all was be?

A

all waves can be reflected, refracted and diffracted

Physics (24 decks)

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