The Electromagnetic System

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Electromagnetic System

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24 Terms

1

Electromagnetic System

The opposite range of different wavelengths that compose Electromagnetic radiation.

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2

Radio Waves

  • Longest wavelengths

  • Lowest frequencies

  • Use on earth: transmits radio/Tv signals

  • Scientific use: to study the composition, structure, and motion of celestial objects

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3

Microwaves

  • 2nd longest wavelengths

  • Low frequencies

  • Use on earth: Microwave ovens, cell phones, wifi, and bluetooth

  • Scientific use: to learn about the galaxies and stars that are behind clouds of dust

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4

Infrared

  • Means “below red”

  • Lower frequency/ longer wavelength than visible red

  • 2 types:

    Heat from Sun; used in toaster ovens/grills

    Used in remote controls

  • Scientific use: to map out dust between stars

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5

Visible Light

  • Only part in spectrum we can see

  • Red(longest)

  • Purple(shortest)

  • Radiated as white light but can be separated into different colors

  • Scientific use: to study the composition of objects of the universe

  • Determine: size, temp, age of stars

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6

Ultraviolet

  • Shorter wavelengths/ higher frequency than visible light

  • Found naturally in sunlight; causes sunburn & cancer

  • Scientific use: to study very hot areas of universe like center of galaxies

  • Newly formed stars emit lots for study of structure/evolution

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7

X-rays

  • 2nd shortest wavelengths/ high frequencies

  • Makes images of bodies

  • Scientific use: to study events that are hotter/more energetic than other stars

  • Neutron stars emit X-rays

  • Emitted by supernovas to find blackholes

  • Structure and evolution of the universe

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8

Gamma Rays

  • Shortest wavelengths/highest frequencies & energies

  • Produced: power generations

  • Radioactive/causes and treats cancer

  • Solar flares cause gamma rays

  • Scientific use: to study high energy in universe/the origin and how far it expands

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9

Electromagnetic waves transfer from one place to another.

Energy

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10

As frequency increases, wavelength .

decreases

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11

As frequency decreases, wavelength .

increases

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12

Shorter Wavelengths = ___________ __________.

Higher energy

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13

Transferse (i don’t think that’s spelled correctly)

Electromagnetic waves & vibrations are at right angles at direction of travel.

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14

All electromagnetic waves travel through space at the _________ ___ _______.

Speed of light

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15

How many m/s is the speed of light?

300,000,000 m/s

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16

Lightyear

The distance the speed of light travels in 1 year (9.5 million km)

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17

The EMS contains types of radiation by…?

Wavelengths, frequency, and energy

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18

The Doppler Effect (Redshift)

Describes wavelengths of energy shift as objects move.

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19

As objects move toward you toward you, waves become _______________.

compressed

  • (Sound: higher; color: blue)

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20

As objects move away, waves become _____________.

stretched

  • (Sound: lower; color: red)

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21

Edwin Hubble

  • Noticed galaxies we see from Earth experience redshift; therefore, must move away from Earth

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22

If objects move away…

Universe expands

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23

By __________, scientists determine ______ at which star is moving & calculates distances from Earth

Redshift; speed

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24

Why are Gamma Rays so dangerous and damaging?

  • They generate an overwhelming amount of energy

  • Short wavelength

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