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Physics Luke > As Waves > Flashcards

As Waves Flashcards

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1
Q

What is the equation for the refractive index of light??

A

c\v = n

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2
Q

What is maulus law? And the two sub laws

A

A= Ao Cos©
I proportional A^2

Maulus law
I=I^2 Cos^2©

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3
Q

What is the equation of the Doppler effect including f, v and c

A

V/C = ∆f/f = ∆✓/✓

✓ is wavelength

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4
Q

The equation of the ratio of Doppler effect?

A

Z= V/C

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5
Q

What is C in the the Doppler effect?

A

The speed of the wave

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6
Q

What is Snell’s law??

A

Sini / Sinr. = n

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7
Q

Which direction does a wave bend if it slows down?

A

If it slows down, it goes towards the normal

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8
Q

What is n, I’m terms of speed?

A

Speed 1 / speed 2 = n

Where 1 is the initial

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9
Q

At what angle will light be internally retracted

A

At the critical angle

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10
Q

What remains constant throughout retraction

A

The frequency

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11
Q

What remains constant throughout retraction

A

Frequency

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12
Q

When do you get construction path difference?

A

When the multiple of the wavelength is

n✓

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13
Q

When do you get deconstructive path difference?

A

When the multiple is n/2 ✓

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14
Q

To be coherent what must be the same?

A

They must have the same wavelength thus colour of lightt

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15
Q

What is the principle of superposition?

A

States that when two waves meet at a point the resultant displacement at that point is equal to the sum of displacements of the individual waves.

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16
Q

What is the difference between path and phase difference?

A

Path is the difference in distance- a Length

Phase is a a measurement in degrees or radians

17
Q

What is the refraction law?

A

n1 sin©1 = n2 sin©2

18
Q

The equation for critical angle?

A

Sin C = 1/n

19
Q

Properties of EM waves?

A

Can travel through a vacuum

Travel at C

Are transverse

Made up of electromagnetic and electrical

20
Q

What is frequency?

A

The number of wavelengths passing through a point per unit time

21
Q

Which direction does the energy travel in a longitudinal wave?

A

In the direction of motion

22
Q

What is diffraction?

A

Is the spreading of a wave when it passing through a narrow gap.

The SPEED, WAVELENGTH and FREQUENCY, do not change

There is significant diffraction when the width is similar to the wavelength of the wave

( why can be heard through doors)

23
Q

What is a in the YDS experiment and how would you measure it

A

The fringe separation, using a travelling microscope

24
Q

How did Young produce coherent light?

A

He either put a colour filter or he added a single slit before the double ones

25
Q

What is the other equation for YDS experiment?

A

d sin©=n✓

26
Q

Why does white light split up??

A

Because of sin© proportional to the wavelength

So the bigger the angle the longer the wavelength

27
Q

What is the velocity of the wave equal?

A

V= √T/Ù. Ù= mass/ length

28
Q

What is the wavelength better two NODES?

A

1/2✓

29
Q

What is the wavelength of a Antinode and node?

A

1/4 ✓

30
Q

What does the fundamental frequency mean?

A

The lowest frequency of virbration per arrangement

31
Q

Is the length of the string is L, what’s the length of the wavelength if you know the fundamental frequency?

A

2L

32
Q

What do all the lettes mean?

d sin© = n✓

A 
n= the order (0th is the middle)
✓= wavelength
d = the distance between slits

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