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Light and Colour > Light and Colour > Flashcards

Light and Colour Flashcards

1
Q

Is light a wave or a particle?

A

light is both a wave And a particle (wave - particle duality)

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2
Q

What are the hues/colours of visible light

A

Red, Orange, Yellow, Green, Blue, Violet (ROYGBV)

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3
Q

What colours make up white light

A

All of them

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4
Q

Put these in order of wavelength from longest to shortest:

Microwaves, Radio Waves, infrared, Gamma rays, X-rays, Visible light, Ultraviolet light

A 
Radio
Microwave
Infrared
Visible Light
Ultraviolet
X-ray
Gamma Rays
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5
Q

Longer wavelength = _____ frequency

A

Longer wavelength = lower frequency

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6
Q

Higher frequency waves have ____ wavelengths

A

Higher frequency waves have shorter wavelengths

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7
Q

What is the frequency wavelength range of visible light

A

720nm - 380nm

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8
Q

Red light has a ____ frequency than Ultraviolet light

A

Red light has a lower frequency than Ultraviolet light

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9
Q

Higher Amplitude = ____ colours

A

Higher Amplitude = brighter colours

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10
Q

What type of waves have wavelengths on the scale of humans - buildings

A

Radio Waves

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11
Q

Infrared has a ____ frequency and ____ wavelength than visible light

A

Infrared has a lower frequency and longer wavelength than visible light

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12
Q

Ultraviolet light (UV) has a ____ frequency and ____ wavelength than visible light

A

Ultraviolet light (UV) has a higher frequency and shorter wavelength than visible light

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13
Q

Define Reflection

A

Reflection is when the wave hits a surface and bounces off and
no radiation absorbtion

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14
Q

Define Refraction

A

Refraction is when the wave hits another medium at an angle and bends

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15
Q

What determines the angle during refraction?

A

The refraction index

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16
Q

Define Diffraction

A

Diffraction is when the wave bends around a barrier and spreads at oblique angles
OR interacts with edges of an opening

17
Q

light waves are ____ in all planes to the direction they are going

A

light waves are perpendicular in all planes to the direction they are going

18
Q

Define interference

A

Interference I when two or more waves superpose to form a resultant wave

19
Q

What is destructive interference?

A

Destructive interference is when out of phase waves superpose and give a lower resultant amplitude

20
Q

What is meant by “out of phase”?

A

When troughs of one wave occur at crests of the other

21
Q

What is constructive interference?

A

When the resultant wave has higher amplitude. The amplitude is given by the sum of both

22
Q

“To see colour there needs to be a ____, and ____ to interact with light and the eye”

A

“To see colour there needs to be a source, and object to interact with light and the eye”

23
Q

What do polarisers do?

A

Polarisers restrict polarisation (select one direction)

24
Q

What are additive colours?

Give examples

A

Colours seen directly

eg. Primary colours from screens (Red, Green, Blue, i.e RGB )

25
Q

How do subtractive colours work?

A

Light interacts with/ hits an object

One colour is absorbed and the complimentary is reflected and then observed

26
Q

What are the complimentary colours of red, green and blue (i.e when red is absorbed what is reflected)

A

Red: Cyan ( =blue+green)

Green: Magenta (=red+blue)

Blue: Yellow (=red+green)

27
Q

Where is subtractive colour mixing used

A

In dyes and pigments

28
Q

What is fluorescence?

A

Fluorescence is a form of luminescence where light is emitted by a substance that has absorbed light or other electromagnetic radiation

29
Q

How much energy, E, are photons are emitted with during florescence ?

A

E = hf

30
Q

What are h and f in E = hf?

A 
h = plank's constant
f = frequency
31
Q

Explain Stokes Shift

A

Light of a certain Wavelength is absorbed

Excitation of electrons to higher energy levels

Energy is released i.e heat and light (photons)

Electrons return to ground state

Light is emitted at a higher wavelength (lower frequency)

32
Q

What is the main difference between fluorescence and phosphorescence?

A

Fluorescence: emission is immediate and therefore only visible if the light source is continuously on

Phosphorescent material: Stores the absorbed light for some time and releases light later; an afterglow persists for a few seconds after the light has been switched off.

33
Q

Stokes Shift: Emitted light has ___ energy than absorbed light

A

Emitted light has less energy than absorbed light

Light and Colour (1 decks)

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