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(HS) Optics 8 > Light > Flashcards

Light Flashcards

1
Q

What is the wave model of light?

A

Light is a type of wave that travels through empty space and transfers energy

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2
Q

What are the 3 properties of light?

A
  1. Light travels in a straight line
  2. Light can be refracted, reflected or absorbed (determines the transparency of materials)
  3. Visible light is made up of different colours
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3
Q

What is refraction?

A

When light bends or changes directions as it changes speed

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4
Q

What is reflection?

A

When light strikes an object and bounces off

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5
Q

What happens when light strikes an object?

A

Some colors are reflected and some are absorbed, only the reflected colors can be seen

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6
Q

What is a spectrum?

A

A band of colors that forms hen white light is separated into its different colors

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7
Q

What are the 3 additive primary colors?

A

Green, blue, red

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8
Q

Blue + green = ?

A

Cyan

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9
Q

Green + red = ?

A

Yellow

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10
Q

Red + blue = ?

A

Magenta

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11
Q

Red + green + blue = ?

A

White

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12
Q

What are properties (2) of radio waves? Give examples.

A
  • Longest wavelength
  • AM radio waves are about 1 km long

ex: AM/FM radio, tv, cell phone, MRI

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13
Q

What are properties (2) of microwaves? Give examples.

A
  • Type of radio wave
  • About 1 cm long

ex: microwave oven, communication

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14
Q

What are properties (2) of infrared (IR) waves? Give examples.

A
  • About 1000 waves can fit in 1 cm
  • Emitted by living things and warm objects

ex: heat lamps, remote controls

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15
Q

What is a property of visible light? Give examples.

A
  • ROYGBIV

ex: artificial light, laser

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16
Q

What are properties (3) of ultraviolet (UV) waves? Give examples.

A
  • 1 million waves fit in 1 cm
  • Needed to make vitamin D
  • can cause skin cancer

ex: suntanning, kill bacteria

17
Q

What are properties (2) of x-ray waves? Give examples.

A
  • 100 million waves in 1 cm
  • Pass through skin but not through bones

ex: x-ray photos, airport security

18
Q

What are properties (2) of gamma ray waves? Give examples.

A
  • Shortest wavelength
  • 10 billion waves in 1 cm

ex: radiation therapy, study galaxies

(HS) Optics 8 (6 decks)

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