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Jeopardy Rules - PowerPoint PPT Presentation


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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.

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slide2

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.
slide3

Jeopardy

Choose a category.

You will be given the answer.

You must give the correct question.

BEGIN

wave properties 100
Wave Properties - $100

This wave property is the inverse of the period of a wave.

slide5

Wave Properties - $100

What is the frequency?

f = 1/T

slide6

Wave Properties - $200

A particle in a transverse wave oscillates about this place.

slide7

Wave Properties - $200

What is its equilibrium position?

slide8

Wave Properties - $300

A longitudinal wave is composed of these types of regions.

slide9

Wave Properties - $300

What are compressions and rarefactions?

Compressions are regions of high pressure. Rarefactions are regions of low pressure.

slide10

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.

slide11

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.

slide12

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.

slide13

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

slide14

Propagation Nation - $100

A transverse wave passes through a uniform medium from left to right. The vibration of the particles is in this direction.

slide15

Propagation Nation - $100

What is up and down?

In a transverse wave, the particles move perpendicular to the direction of the propagation.

slide16

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.

slide17

Propagation Nation - $200

What is 0.0043 s?

v=f*λ to solve for f and then the period T = 1/f.

slide18

Propagation Nation - $300

The energy of a mechanical wave is related to this.

slide19

Propagation Nation - $300

What is the amplitude?

Like a stretched spring with energy 1/2kx2 (i.e. energy ∝ x2, withx the displacement from equilibrium) , the energy of a wave is proportional to A2 (with A the displacement from equilibrium).

slide20

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)

slide21

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.

slide22

Daily Double

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

slide23

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.

slide24

Daily Double

What is decrease?

λ/d=∆X/D

λpurple is shorter than red, so ∆X will decrease. Thus, d must decrease to increase ∆X.

slide25

Wave Funomena I - $100

By increasing the frequency of a sound, you are increasing this.

slide26

Wave Funomena I - $100

What is the pitch?

The pitch of a sound is measured by its frequency.

slide27

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.

slide28

Wave Funomena I - $200

What is resonance?

When a frequency matches the natural frequency of a system, it stimulates oscillations in that system.

slide29

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.

slide30

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.

slide31

Wave Funomena I - $400

These properties change when a wave reflects off a barrier.

slide32

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.

slide33

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)

slide34

Wave Funomena I - $500

What is Lake 1, diffraction?

Noticeable diffraction occurs when the wavelength is comparable in size to the opening.

slide35

Wave Funomena II - $100

This is the part of a standing wave with maximum amplitude.

slide36

Wave Funomena II - $100

What is an antinode?

An antinode is the place on a standing wave with maximum constructive interference.

slide37

Wave Funomena II - $200

When a water wave passes from deep water to shallow water, it bends in this direction.

slide38

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.)

slide39

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.

slide40

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.

slide41

Daily Double

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

slide42

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.

slide43

Daily Double

What is 10 Hz?

Fourth Harmonic: n=4

f4=v/λ=(8 m/s)/(0.2 m) = 40 Hz

Fundamental:

f4=4f1 so f1=f4/4=(40 Hz)/4 = 10 Hz

slide44

Wave Funomena II - $500

The wavelength of light must be much smaller than a millimeter because of this observation.

slide45

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.

slide46

Interfearence - $100

When two troughs of two waves meet, you get this type of interference.

slide47

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.

slide48

Interfearence- $200

The conditions for complete destructive interference of two waves is this. (2 part answer)

slide49

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.

slide50

Interfearence - $300

The name of the nodal line for which the path difference is 2.5 Lambda is this.

slide51

Interfearence - $300

What is the 3rdorder minimum (n=2)?

Nodal path difference: PD = (n+0.5)λ

PD = 2.5λ = (n+0.5)λ

n=2, 3rd order minimum.

slide52

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.

slide53

Interfearence - $400

What is 0.5 m?

λ=0.5 m, D1=6 m, X1=6 m

λ/d=X1/D1

d=λD1/X1

=0.5 m*6 m/6 m = 0.5 m

slide54

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 3rd order minimum?

slide55

Interfearence - $500

What is 2.0 cm?

∆X=0.8cm. 3rd 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.