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Grade 10 - SNC2D > Physics: Producing Visible Light > Flashcards

Physics: Producing Visible Light Flashcards

1
Q

What is the most important natural source of light on Earth?

A

The Sun

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2
Q

What is the ability for a plant or animal to produce light known as?

A

Bioluminescence

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3
Q

What is bioluminescence?

A

The ability for a plant or animal to produce light.

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4
Q

What is natural light?

A

Light produced by the sun or other stars.

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5
Q

What is artificial light?

A

Light produce through human technology.

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6
Q

What is incandescent light?

A

Light produced by an object, such as a metal, that is at a very high temperature.

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7
Q

What type of light is produced by an object, such as a metal, that is at a very high temperature?

A

Incandescent Light

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8
Q

What is fluorescent light?

A

Fluorescent light is emitted by some substances when they are exposed to electromagnetic radiation.

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9
Q

What type of light is emitted by some substances when they are exposed to electromagnetic radiation?

A

Fluorescent Light

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10
Q

What is inside of a fluorescent light bulb?

A

The bulb is filled with a small amount of gas such as mercury vapour and the sides are coated with a white powder called a phosphor.

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11
Q

What type of bulb is filled with a small amount of gas such as mercury vapour?

A

Fluorescent Light Bulb

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12
Q

What is phosphorescent light?

A

The source stores the energy from a light source and emit it slowly over a long period of time. Glow-In-The-Dark

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13
Q

What type of light stores the energy from a light source and emit it slowly over a long period of time?

A

Phosphorescent Light

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14
Q

What is chemiluminescence?

A

Light produced from a chemical reaction without a rise in temperature. Sometimes referred to as cool light.

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15
Q

What type of light is produced from a chemical reaction without a rise in temperature?

A

Chemiluminescence

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16
Q

What is an example of chemiluminescence?

A

Glow Sticks

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17
Q

What are glow sticks an example of?

A

Chemiluminescence

18
Q

What is triboluminescence?

A

Producing light from friction.

19
Q

What type of light is produced from friction?

A

Triboluminescence

20
Q

How is triboluminescence produced?

A

Breaking apart sugar crystals, rubbing a diamond, rubbing some crystals together or crushing some crystals.

21
Q

What type of light is produced by breaking apart sugar crystals, rubbing a diamond, rubbing some crystals together or crushing some crystals?

A

Triboluminescence

22
Q

What is electric discharge?

A

A method for producing light in which an electric current passes through the air or another gas, such as neon.

23
Q

What type of light is produced by an electric current passing through the air or another gas?

A

Electric Discharge

24
Q

What is an example of electric discharge?

A

Lightning

25
Q

What is lightning an example of?

A

Electric Discharge

26
Q

What is electroluminescence?

A

The process of transforming electrical energy directly into light energy.

27
Q

What is the process of transforming electrical energy directly into light energy known as?

A

Electroluminescence

28
Q

What are LEDs?

A

A light-emitting diode is an electroluminescent light source made out of a semiconductor.

29
Q

What type of light is an electroluminescent light source made out of a semiconductor?

A

LED (Light-Emitting Diode)

30
Q

What is a pro to LEDs?

A

They radiate very little heat, making them very efficient.

31
Q

What are some uses for LEDs?

A

Electronic billboards, traffic lights, decorative lights, handheld displays and very efficient LED light bulbs.

32
Q

What type of light is used in electronic billboards, traffic lights, decorative lights, handheld displays and very efficient light bulbs?

A

LEDs

33
Q

What are OLEDs?

A

An organic light-emitting display is a light source made of several extremely thin layers of organic molecules that use an electric current to produce light.

34
Q

What type of light is made of several extremely thin layers of organic molecules that use an electric current to produce light?

A

OLEDs

35
Q

What is a pro to OLEDs?

A

They use less energy than some other displays because because they do not require a backlight to function.

36
Q

What are some uses for OLEDs?

A

Small screens such as cell phones, medical equipment and head-mounted displays.

37
Q

What type of light is used in small screens such as cell phones, medical equipment and head-mounted displays?

A

OLEDs

38
Q

What are some cons to OLEDs?

A

They are more expensive to produce than other displays and are easily damaged by water.

39
Q

What is an LCD?

A

In a liquid crystal display, a white light, such as a fluorescent light or LED shines behind a liquid crystal. A liquid crystal is a solid that can change the orientation of its molecules like a liquid, but only when electricity is applied. The crystal can block or transmit light depending on how much electricity is applied to it. Red, blue and green filters are placed in front of the crystal to produce colours. A polarizing filter blocks the red, blue or green colours in any combination to produce any colour of light.

40
Q

What type of light has a white light shine behind a liquid crystal, which then passes through red, green and blue filters and finally a polarizing filter to block out some colours to produce any combination of light?

A

LCD

41
Q

What is a plasma display?

A

A plasma display is composed of many tiny fluorescent lights to produce each colour. An electrical signal causes a gas, such a neon, to release ultraviolet radiation. The UV radiation is absorbed by phosphors that then radiate light in the visible spectrum.

42
Q

What type of light is composed of many tiny fluorescent lights and phosphors?

A

Plasma Display

Grade 10 - SNC2D (43 decks)

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