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Year 11 Physics Unit 2 > Topic 2 - Waves > Flashcards

Topic 2 - Waves Flashcards

1
Q

What is a pulse?

A

A single wave

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2
Q

What is the amplitude of a wave?

A

The distance from the median line and the crest/trough of the wave

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3
Q

What is a pulse?

A

A single wave

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4
Q

What is amplitude?

A

The distance from the middle of the wave to the crest/trough

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5
Q

What is the wavelength?

A

Distance to complete 1 repetition

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6
Q

T or F: λ represents wavelength?

A

True

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7
Q

T or F: Frequency is the amount of seconds it takes for 1 repetition?

A

False

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8
Q

What is the unit for frequency?

A

Hertz

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9
Q

What is frequency?

A

The number of waves per second

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10
Q

T or F: Period is the time taken for 1 repetition?

A

True

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11
Q

What is the symbol for period?

A

T

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12
Q

What is the equation for period?

A

T = 1/F

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13
Q

How do you find the speed of a wave?

A

V = F(frequency) x λ (wavelength)

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14
Q

T or F: Intensity is the same as impulse?

A

False

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15
Q

What is the equation for Intensity?

A

I = W / r(distance)^2

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16
Q

What does intensity measure?

A

Power over area

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17
Q

What is the distance between transverse and longitudinal waves?

A

Transverse are an object moving, longitudinal are compressions of air.

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18
Q

T or F: Talking uses longitudinal waves?

A

True

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19
Q

When a rope/wave is fixed to a wall, what will the wave do when it hits the wall?

A

Reflect

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20
Q

T or F: A wave will stay the same when hitting a wall without being secured?

A

True

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21
Q

If a rope changes from light to heavy, will any of the wave be reflected?

A

Yes

22
Q

If a heavy rope changes from heavy to light, what will the velocity do?

A

Increase

23
Q

What is the law of reflection?

A

I (incidence) = R (reflection)

24
Q

What is refraction?

A

The lengthening /shortening of wavelengths based on medians

25
Q

If a wave travels into a denser medium, will the wavelengths increase or decrease?

A

Decrease

26
Q

T or F: A wave passing passes into a lighter median, it will refract toward the normal?

A

False

27
Q

What is diffraction?

A

spreading of waves through gaps

28
Q

If a wavelength is equal to a gap, will it diffract?

A

Yes

29
Q

T of F: A gap bigger than the wavelength will result in large diffraction

A

False

30
Q

What is the difference between constructive and destructive superposition?

A

Constructive is 2 waves on the same plane resulting in a larger wave, destructive is 2 waves on different planes resulting in smaller or no waves

31
Q

What is the equation for destructive superposition?

A

(n + 0.5) x λ

32
Q

T or F: Nλ tells if the superposition will be constructive

A

True

33
Q

What is an antinode?

A

The extreme points of a wave

34
Q

T or F: A node is the middle points of a wave?

A

True

35
Q

What is the fundamental frequency?

A

the smallest frequency

36
Q

What is the equation for wavelengths with pipes/strings closed at both ends?

A

λ = (2 x L) / n

37
Q

What does n stand for in λ = (2 x L) / n

A

Number of harmonics/frequencies

38
Q

How do you find frequency for a string/pipe fixed at both ends?

A

F = (n x V) / (2 x L)

39
Q

How do you calculate the frequency of light?

A

F = C / λ

40
Q

What does c mean in light?

A

Speed of light

41
Q

What is the speed of light?

A

~ 3 x 10^8

42
Q

What is the visible range for light in frequencies?

A

400 x 10^12 - 800 x 10^12

43
Q

T or F: A light wave with wavelength 800nm could be seen by the human eye?

A

False

44
Q

What is the visible range of light with wavelengths?

A

790nm - 390nm

45
Q

How many lines do you draw to create a ray diagram?

A

2

46
Q

Where do the 2 lines go for a ray diagram?

A

1 perpendicular to the object until it touches the mirror/lense, 2 straight through the focal point then perpendicular to mirror/lense

47
Q

How far is the focal point?

A

0.5 x Centre

48
Q

How can you find the refractive index?

A

Sin i / sin r = v1 / v2 = λ1 / λ2 = n2 / n1 = index

49
Q

What does the critical angle indicate?

A

Total internal reflection

50
Q

What is the equation for the critical angle?

A

Sin (ic) = n2/n1

Year 11 Physics Unit 2 (2 decks)

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