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Physics > Waves > Flashcards

Waves Flashcards

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1
Q

what is a progressive wave?

A

waves that transfer enery (from one point to another)

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2
Q

true or falce. waves tranfer energy but not matter

A

True

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3
Q

What is a non-progressive wave?

A

stationary or standing wave

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4
Q

waves consist of pulses what is a pulse?

A

one pulse is the aria under one hump on a graph of a wave

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5
Q

what is a pulse or wave caused by?

A

the disturbance of a medium

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6
Q

true or falce. waves do not consist of matter they travel through a medium

A

true

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7
Q

what is a Transverce wave?

A

a wave where the direction of motion (energy transfered) is perpendicular to the direction of disturbance

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8
Q

what is displacment of a wave?

A

the difference between the x acis and the wave

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9
Q

what is the wavelength?

A

the distance between two consicitive points on a wave with the same orientation

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10
Q

what are crests and troughs?

A

a crest is the highest point of the wave and a trough is the lowest point of a wave

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11
Q

what is the amplitude?

A

the maximum displacement

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12
Q

what is wavelength mesured in?

A

meters

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13
Q

define Frequency (f)

A

the number of complete ossolations/cycles per second (messured in Hz)

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14
Q

define Period (T)

A

Time Taken for one complete cycle/oscillation (messured in seconds)

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15
Q

what is period equal to in terms of frequency

A

period = 1/frequency
T = 1/f

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16
Q

what is frequency equal to in terms of period

A

frequency = 1/period
f = 1/T

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17
Q

how do yo find speed of a wave?

A

V = wavelenght x frequency

18
Q

define phase difference

A

by how much (degrees, rad or wavelengths) one point on a wave is ahead of another
or
one wave is ahead of another

19
Q

true or falce. to calculate the phase difference between two waves they must have the same frequency

A

True

20
Q

true or falce. for two waves to be in phase there crests troughts and x axis intersections must all happen that the exact same time

A

True

21
Q

what is an inverce wave

A

the reflection of a wave across the x axis

22
Q

in a cathode ray ocilliscope (CRO) what does the y axis represent?

A

the voltage or current

23
Q

in a cathode ray ocilliscope (CRO) what does the x axis represent?

A

time

24
Q

what is one block on a cathode ray ocilliscope (CRO)?

A

one time base (messured in millie seconds)

25
Q

what is intencity deffinition?

A

the amount of energy per unit time that passes through a unit aria

Intencity = power/aria

26
Q

what is intencity proportional to?

A

Aria^2 or Frequency^2

27
Q

define a sperical wave

A

a wave from a point sorce which spreads out equaly in all directions
Intencity = power/(4 pi r^2)

28
Q

what are some examples of transverse waves?

A

electromagnetic waves: radio, visible light, UV
vibrations on gituar string (not sound)
can be shown on rope

29
Q

can transverce waves be polorised?

A

yes

30
Q

what do longatudinal waves have instead of crests and troughs?

A

rarefactions and compressions

31
Q

true or falce. all waves can be difracted

A

True

32
Q

can longitudinal waves be polorised?

A

no

33
Q

give two examples of longaudinal waves

A

sound and ultrasound

34
Q

define the doppoler effect/shifft

A

when the percived frequency or pitch of a wave (sound or ligh) is different to the actual frequency emitted due to the relative motion of the observed and/or sorce

35
Q

what will you hear when a car is speeding towards you and why

A

you will hear an increce in pitch due to the sound waves being compressed in front of the car (more ossilations reaching you per second (Hz))

36
Q

what will happen when a car speeds passed you and why

A

after the car passes you the pitch will drop drasticaly as the waves now expand towards you (less ossilations per second(Hz))

37
Q

what is the equation for the doppoler effect?

A

observed frequency = sorce frequency (wave velocity / (wave velocity +- sorce velocity))

38
Q

ROYGBIV is the visible light on the electromagnetic spectrum. what does it stand for?

A

Red
Orange
Yellow
Green
Blue
Indigo
Violate

39
Q

does wavelength increce towards the red end of the electromagnetic spectrum?

A

yes

40
Q

does frequency increce towards the blue end of the electromagnetic spectrum?

A

yes

41
Q

wha are proporties of electromagnetic waves?

A

all transverce
can travel in vaccume
travel at 3x10^8 m/s (speed of light)
they are self propogating (dont need a medium)

Physics (9 decks)

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