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Science > Unit 7- The E/M Spectrum > Flashcards

Unit 7- The E/M Spectrum Flashcards

1
Q

How are mechanical waves created?

A

Vibration

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2
Q

Are mechanical waves transverse or longitudinal?

A

Both

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3
Q

True or false: mechanical waves carry energy

A

True

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4
Q

What does a mechanical wave require to be classified as a mechanical wave?

A

A medium

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5
Q

Is light a mechanical or an electromagnetic wave?

A

Electromagnetic

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6
Q

Produced when an electric charge vibrates up and down or accelerates

A

Electromagnetic wave

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7
Q

What are the two parts that make up an electromagnetic wave?

A

Electric field and magnetic field

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8
Q

True or false: the electric and magnetic field regenerate eachother

A

True

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9
Q

True or false: electromagnetic waves needs a medium to travel through

A

False

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10
Q

What type of energy do electromagnetic waves carry?

A

Radiation energy

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11
Q

What is the speed of sound?

A

343 M/s

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12
Q

What is the speed of light?

A

300,000,000 M/s or 3x10(8)

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13
Q

Both sound and light use what equation?

A

Wave equation V=f(wavelength)

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14
Q

Who is Michelson?

A

Accurately measured the speed of light

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15
Q

Who is Newton?

A

Proposed light travelled as a particle

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16
Q

Who is Young?

A

Discovered interference and saw that it happens with waves, so light must be a wave

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17
Q

Who is Einstein?

A

Found the photoelectric effect

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18
Q

How do photons travel?

A

In all directions away from light, they spread out a way from the source.

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19
Q

Who is Herschel?

A

First guy to study the E/M spectrum

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20
Q

Is red or blue light warmer?

A

Red light

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21
Q

What is a Radio Wave?

A

Longest wavelength, but shortest frequency

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22
Q

What are TV waves?

A

Radio waves that also carry info for pictures.

23
Q

What are Microwaves?

A

Highest frequency radio waves, cell phones use microwaves.

24
Q

What is Radar?

A

Uses short burst of radio waves, then they change frequency when they hit objects and bounce back.

25
Q

What is Infrared (IR)?

A

Invisible to the human eye, if objects are hot they give off more IR.

26
Q

What is Visible light?

A

The only part of the EM spectrum we can see.

27
Q

What is Ultraviolet light?

A

Bad for skin in large doses, can cause cancer.

28
Q

What is X-ray?

A

High energy to penetrate objects, see inside human body.

29
Q

What is Gamma?

A

Highest energy waves and frequency, lowest wavelength. Used to kill cancer cells.

30
Q

What materials can be classified as?

A

Transparent, translucent, opaque

31
Q

What is transparency?

A

Let’s all light through

32
Q

What is Translucent?

A

Let’s some light through, make objects look “fuzzy”

33
Q

What is opaque?

A

Doesn’t let any light through.

34
Q

What happens when a light strikes a material?

A

Reflected, absorbed or transmitted.

35
Q

How is light reflected?

A

Takes parallel light rays and reflects them in predictable ways.

36
Q

How is light transmitted?

A

Refraction, polarization and scattering

37
Q

What’s refraction?

A

Rays of light bend

38
Q

What is white light consisted of?

A

All the colors, (ROYGBIV).

39
Q

What is polarization?

A

Unpolarized light vibrates in all directions, then polarized light chops off the vibrations.

40
Q

If an object is red, what colors are absorbed?

A

Every color but red.

41
Q

What happens when you send light through a prism?

A

It refracts/bends.

42
Q

What is Dispersion?

A

When light bends/refracts.

43
Q

Primary colors for mixing light?

A

Red, Green, Blue

44
Q

Secondary colors for mixing lights?

A

Cyan, Magenta, Yellow

45
Q

How is light made?

A

Electrons jump energy levels after absorbing energy. They emit photons.

46
Q

What are incandescent bulbs?

A

Regular bulbs, argon doesn’t react with the filament allowing it to last a long time.

47
Q

What is Filament?

A

Thin coil of wire that gets very hot when electrons pass through

49
Q

What is in the inside of a fluorescent bulbs?

A

Phosphors that emits light.

50
Q

What is laser light?

A

The light is coherent.

51
Q

What is neon light?

A

He (pink), Ne (red), Krypton (violet)

52
Q

What are sodium vapor lights?

A

Very bright and efficient, usually street lights

53
Q

What are tungsten-halogen lights?

A

Like incandescent bulbs, with different gases.

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