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Physics > Waves: Sound and Light > Flashcards

Waves: Sound and Light Flashcards

1
Q

Converging mirror

A

Reflects light rays => converge at point in front of mirror

- Concave

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2
Q

Converging lens

A

Refracts light rays => converge at point on opposite side of lens as the source

  • Convex
  • Three c’s: thicker center converges (light)
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3
Q

Concave mirror

A

Looks like entrance to a cave (caved in)

  • Converging
  • Light reflects to convergence point
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4
Q

Convex lens

A

Thick center relative to periphery

  • Converging
  • Opposite of convex mirror
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5
Q

Diverging mirror

A

Reflects light rays => observer perceives them converging on point opposite side of the mirror from the observer
- Convex

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6
Q

Diverging lens

A

Refracts light => appear to converge at point on same side of lens as light source
- Concave

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7
Q

Concave lens

A

Diverging

- Opposite of concave mirror

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8
Q

Convex mirror

A

Diverging

- Light goes off in all different directions

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9
Q

Virtual image

A

Cannot be captured on a screen

- Upright, opposite side of lens/mirror as observer, negative

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10
Q

Real image

A

Can be captured on screen

- Inverted, same side of mirror/lens as observer, positive

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11
Q

When object is located w/in focal length, converger forms ______

A

Virtual and upright image

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12
Q

When object is located beyond focal point, converger forms _____

A

Real and inverted image

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13
Q

Thin Lens Equation

A

1/ƒ = 1/do + 1/di

  • do = p = object distance
  • di = q = image distance
  • f = focal distance
  • Units = cm-1
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14
Q

Focal distance of converging lens/mirror = _____ sign

A

Positive

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15
Q

Focal distance of diverging lens/mirror = ______ sign

A

Negative

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16
Q

If height of image > height of object…

A

Image is larger than object

17
Q

Magnification equation

A

m = -di/do = hi/ho

  • Di do hi ho
  • Image w/ same orientation as object = positive m
18
Q

Diverging mirrors/lenses always form images that are _____ than the objects they represent

A

Smaller

19
Q

Converging mirrors/lenses form images that are _____ than the objects they represent unless _____

A

Larger unless object is at or outside radius of curvature

20
Q

Wavelength and frequency are _______ proportional to each other

A

Inversely

c = lambda*v

21
Q

Photon energy = ______ proportional to radiation frequency

A

Directly

22
Q

Kinetic energy of a photoelectron = ________

A

hf - work function

23
Q

Equation with frequency and wavelength

A

c = lambda*v

24
Q

Energy of a photon

A

E(photon) = hv

25
Q

Period = ______

A

1/frequency

26
Q

Photoelectric effect

A

E(photon) = Eo + KE(photoelectron)

  • Eo = work function
27
Q

What is a photoelectron?

A

A photon that hits a plane with enough energy to knock the electron loose

28
Q

If E(photon) > work function…

A

The photon will have enough energy to produce a photoelectron

29
Q

Equation for speed of light

A

c = f*lambda

30
Q

Speed of sound depends on what?

A

Only on the properties of the medium through which it’s traveling

  • Density, temperature
31
Q

Formula for speed of sound

A

V = √(B/p)

  • B = bulk modulus = how hard a material is to compress (stiffness)
  • p = density (rho)
32
Q

What does cooling down air do to the speed of sound?

A

Decreases speed of sound b/c makes medium more dense

33
Q

Intensity

A

Power / Area

34
Q

log(1,000,000,000)

A

9

  • Just count number of zeros
  • Same as x in 10^x
35
Q

Units of intensity

A

W/m^2

36
Q

Area of a sphere

A

4πr^2

37
Q

Wavelength of a standing wave (open tube)

A

Lambda (n) = 2L/n

  • All the possible wavelengths for standing wave
  • n = harmonic number
  • First harmonic = fundamental wavelength
38
Q

Wavelength of standing wave (closed tube)

A

4L/n

  • n can only be odd integers
  • Only odd harmonics
39
Q

Increase distance b/w sound waves => what happens to perceived wavelength?

A

Perceived wavelength increases

Physics (6 decks)

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