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Wave Properties Propagation Nation Wave Funomena 1 Wave Funomena 2 Interfearence $100 $200 $300 $400 $500.

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Presentation on theme: "Wave Properties Propagation Nation Wave Funomena 1 Wave Funomena 2 Interfearence $100 $200 $300 $400 $500."— Presentation transcript:


2 Wave Properties Propagation Nation Wave Funomena 1 Wave Funomena 2 Interfearence $100 $200 $300 $400 $500

3 Jeopardy Rules State your answers in the form of a question. Teams are chosen randomly to select each clue. When a team selects a clue, every team solves it. If the team who selects the clue is incorrect, another randomly selected team gets to try, until the answer is found. There are two Daily Doubles, where a team can wager their winnings on a clue. Only one team may wager. Correct answers gain a team the dollar value, incorrect answers subtract the dollar value.

4 Choose a category. You will be given the answer. You must give the correct question. BEGIN

5 Wave Properties - $100 This wave property is the inverse of the period of a wave.

6 Wave Properties - $100 What is the frequency? f = 1/T

7 Wave Properties - $200 A particle in a transverse wave oscillates about this place.

8 Wave Properties - $200 What is its equilibrium position?

9 Wave Properties - $300 A longitudinal wave is composed of these types of regions.

10 Wave Properties - $300 What are compressions and rarefactions? Compressions are regions of high pressure. Rarefactions are regions of low pressure.

11 Wave Properties - $400 A wave pulse traveling down a rope is measured to be 0.3 m from trough to crest. The amplitude of the pulse is this.

12 Wave Properties - $400 What is 0.15 m? Amplitude is measured from the equilibrium position. If crest to trough is 0.3 m, then A = 0.3m/2 = 0.15 m.

13 Wave Properties - $500 A beach goer observes a set of 6.5 ocean waves equaling the length of a 26 m dock. The wavelength of a wave is this.

14 Wave Properties - $500 What is 4 m? If 6.5 waves have a length of 26 m, then 1 wave has a wavelength of 26 m/6.5 = 4 m

15 Propagation Nation - $100 A transverse wave passes through a uniform medium from left to right. The vibration of the particles is in this direction.

16 Propagation Nation - $100 What is up and down? In a transverse wave, the particles move perpendicular to the direction of the propagation.

17 Propagation Nation - $200 A sound wave is traveling at 345 m/s. If it has a wavelength of 1.5 meters, this is its period.

18 Propagation Nation - $200 What is 0.0043 s? v=f*λ to solve for f and then the period T = 1/f.

19 Propagation Nation - $300 The energy of a mechanical wave is related to this.

20 Propagation Nation - $300 What is the amplitude? Like a stretched spring with energy 1/2kx 2 (i.e. energy ∝ x 2, with x the displacement from equilibrium), the energy of a wave is proportional to A 2 (with A the displacement from equilibrium).

21 Propagation Nation - $400 When a wave travels in a single medium, this remains constant. When a wave crosses a boundary, this remains constant. (2 part answer)

22 Propagation Nation - $400 What are speed and frequency? A wave’s speed is constant in one medium, but it’s frequency remains constant when crossing a boundary.

23 Daily Double Make your wager, up to your current winnings. You will have 30 seconds to answer.

24 Daily Double Red light produces a 2 slit diffraction pattern with some ∆X. In order to produce a pattern with the same ∆X using purple light, this must happen to the distance between slits, all other variables remaining constant.

25 Daily Double What is decrease? λ/d=∆X/D λ purple is shorter than red, so ∆X will decrease. Thus, d must decrease to increase ∆X.

26 Wave Funomena I - $100 By increasing the frequency of a sound, you are increasing this.

27 Wave Funomena I - $100 What is the pitch? The pitch of a sound is measured by its frequency.

28 Wave Funomena I - $200 Whenever you listen to a particular song, the glass in your coffee table vibrates loudly. The vibrations are due to this effect.

29 Wave Funomena I - $200 What is resonance? When a frequency matches the natural frequency of a system, it stimulates oscillations in that system.

30 Wave Funomena I - $300 Polarized sunglasses block glare off of water because the polarization of the reflected light is oriented this way with the transmission axis of the polarizer.

31 Wave Funomena I - $300 What is perpendicular? Light reflected off of non-metallic surfaces is polarized in the plane of the surface. If the transmission axis of the polarizer is perpendicular to the plane, the light will be blocked.

32 Wave Funomena I - $400 These properties change when a wave reflects off a barrier.

33 Wave Funomena I - $400 What are direction and phase? Reflected waves from a fixed boundary are 180° out of phase with the incident wave and obey the law of reflection.

34 Wave Funomena I - $500 In Lake 1, waves with λ=0.3m pass through an opening with width 0.25m. In Lake 2, waves with λ=0.5m pass through an opening with width 2.0 m. Waves in this lake undergo more of this effect. (2 part answer)

35 Wave Funomena I - $500 What is Lake 1, diffraction? Noticeable diffraction occurs when the wavelength is comparable in size to the opening.

36 Wave Funomena II - $100 This is the part of a standing wave with maximum amplitude.

37 Wave Funomena II - $100 What is an antinode? An antinode is the place on a standing wave with maximum constructive interference.

38 Wave Funomena II - $200 When a water wave passes from deep water to shallow water, it bends in this direction.

39 Wave Funomena II - $200 What is toward the normal? Waves travel slower in shallow water. When they Slow down, they bend Toward the normal. (this is the S.T. in F.A.S.T.)

40 Wave Funomena II - $300 A 1500 Hz sound wave travels from oil into water. Compared to its wavelength in oil, its wavelength in water is this.

41 Wave Funomena II - $300 What is shorter? Water is denser, so the wave speed decreases. Since v=f*λ, and frequency is constant, λ must decrease.

42 Daily Double Make your wager, up to your current winnings. You will have 30 seconds to answer.

43 Daily Double The fourth harmonic of a standing wave on a string has a wavelength of 20 cm. If the speed of these waves is 8.0 m/s, the frequency of the fundamental is this.

44 Daily Double What is 10 Hz? Fourth Harmonic: n=4 f 4 =v/λ=(8 m/s)/(0.2 m) = 40 Hz Fundamental: f 4 =4f 1 so f 1 =f 4 /4=(40 Hz)/4 = 10 Hz

45 Wave Funomena II - $500 The wavelength of light must be much smaller than a millimeter because of this observation.

46 Wave Funomena II - $500 What is light only diffracting through slits much smaller than a millimeter? Light does not diffract through 1 mm slits, because the size of the gap is not comparable to the wavelength.

47 Interfearence - $100 When two troughs of two waves meet, you get this type of interference.

48 Interfearence - $100 What is constructive interference? Constructive interference happens any time either two crests or two troughs meet, resulting in a wave of higher amplitude than either of the individual waves alone.

49 Interfearence- $200 The conditions for complete destructive interference of two waves is this. (2 part answer)

50 Interfearence - $200 What are 180° out of phase and equal amplitudes? The waves must be out of phase and have equal amplitudes, or the destructive interference will only be partial.

51 Interfearence - $300 The name of the nodal line for which the path difference is 2.5 Lambda is this.

52 Interfearence - $300 What is the 3 rd order minimum (n=2)? Nodal path difference: PD = (n+0.5)λ PD = 2.5λ = (n+0.5)λ n=2, 3 rd order minimum.

53 Interfearence - $400 Plane sound waves of λ = 0.5 m are incident on two narrow slits. At point P is a first order maximum, which is 6 m from the center of the slits and 6 m from the central maximum. The distance between the slits is this.

54 Interfearence - $400 What is 0.5 m? λ=0.5 m, D 1 =6 m, X 1 =6 m λ/d=X 1 /D 1 d=λD 1 /X 1 =0.5 m*6 m/6 m = 0.5 m

55 Interfearence - $500 If a 2 slit interference pattern from a 532 nm laser has a spacing of 0.8 cm, what is the linear displacement from the central maximum to the 3 rd order minimum?

56 Interfearence - $500 What is 2.0 cm? ∆X=0.8cm. 3 rd order minimum is the nodal line n=2, which is 2.5 intervals from the central maximum. 2.5*∆X=2.5*0.8cm = 2.0cm.

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