12.3 +12.4 Young's double slit experiment, stationary waves Flashcards

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1
Q

what does mono-chromatic mean?

A

all the waves emmited are of the same frequeny (colour)

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2
Q

describe why young had this set up

A
  • filter: monochromatic
  • single slit : diffraction would produce a coherant wave, producing a stable interference pattern
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3
Q

what do the fringes suggest?

A

bright fringes:
* contructive interference
* light waves arrive in phase

dark:
* deconstructive interference
* light waves arrive in anti phase

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4
Q

what is the equation from young’s slit experiement?

A
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5
Q

what is a stationary wave?

A

a wave that oscillates in time but does not transfer any (net energy)

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6
Q

how are stationary waves formed?

A

two progressive waves of same frequency propagate in opposite directions and superpose

only certain frequnecies will produce stationary waves (harmonic)

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7
Q

what is the amplitude of a stationary wave for a single point?

A
  • constant at all times time
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8
Q

what is a node?

A

a point of zero displacement

distnace between 2 adjacent nodes =half λ

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9
Q

what is an anti node?

A

a point of maximum displacement

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10
Q

what is the phase difference between 2 adjacent nodes/ anti nodes ?

A

0

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11
Q

what is the phase difference between either side of a node ?

A

π (180 degrees)

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12
Q

what is the phase difference between all points between adjacent nodes?

A

0- they are all inphase, as they all reach maximum displacement together

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13
Q

do stationary waves transfer energy?

A

yes, but not tot heir surroundings

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14
Q

how are nodes and anti nodes created in a stationary wave?

A

between two progressive waves (same frequnecy ) travelling in opposite directions:
* destructive interference, (180 phase difference) = node
* constructive interefence,(0 phase diference) = anti node

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15
Q

what is the difference between the definition of ‘wavelength’ for the two different waves?

A
  • progressive wave: distance between 2 adjacent points oscillating in phase
  • stationary wave: twice distance between adjacent nodes = wavelength of 2 progressive waves (OG) that made the stationary
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16
Q

what is the difference between the definition of ‘phase difference’ for the two different waves?

A
  • progressive wave: the phase chnages across one complete cycle of waves
  • stationary waves: all parts of the wave between a pair of nodes are in phase and on different sides of a node they are in anti phase
17
Q

what is the difference between the definition of ‘amplitude’ for the two different waves?

A
  • progressive wave: all parts of the wave that have the same amplitude
  • stationary wave: maximum amplitude occurs at the anti node then drops to zero at the node
18
Q

What type of wave is a stationary wave?

A

Can be transverse OR Longitudinal (formed by longitudinal waves such as sound waves ), depending on the type of original wave that formed it

19
Q

What are some differences between stationary and progressive waves ?

A

Progressive: all points have the same amplitude
Stationary: points have different amplitudes (nodes have zero amplitude)

20
Q

What is the equation that uses a diffraction grating an indent EM to determine the wavelength?

A
21
Q

What is the equation that uses a diffraction grating an indent EM to determine the wavelength?

A
22
Q

What is the equation that uses a diffraction grating an indent EM to determine the wavelength?

A