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Astronomy > Radiation > Flashcards

Radiation Flashcards

1
Q

What’s the name for waves that can travel through space?

A

Electromagnetic Radiation

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2
Q

Why are they called electromagnetic radiation waves?

A

They travel through electromagnetic fields, rather than matter

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3
Q

What is radiation?

A

Energy that travels in all directions

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4
Q

What are EM waves organized on?

A

Their wavelength

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5
Q

What’s the order of EM waves from longest wavelength to shortest?

A 
Radio wave 
Micro wave
Infrared
Visible light 
Ultraviolet
X-ray
Gamma Ray
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6
Q

What is long-wave radiation?

A

EM radiation with wavelength over 1 micrometer

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7
Q

What are the examples of long-wave radiation?

A

Infrared, microwaves, radio waves

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8
Q

What are the properties of long-wave radiation?

A

High wavelength, and low frequency and energy

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9
Q

Which EM radiation has the greatest wavelength?

A

Radio waves

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10
Q

What’s radio astronomy?

A

The study of radio waves given off by objects in space, like planets stars and galaxies

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11
Q

What produces radio waves?

A

Lightning, humans for radio communication, radar, and tv broadcasting

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12
Q

What was the cosmic microwave background?

A

Light left over from the Big Bang. Oldest light in the universe

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13
Q

What is the highest energy form of long wave radiation?

A

Infrared

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14
Q

IR is the primary source of what on earth?

A

Thermal energy

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15
Q

What is IR produced by?

A

Stars due to nuclear fusion

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16
Q

What is shortwave radiation?

A

EM radiation with wavelength below 1 micrometer

17
Q

What are shortwave properties?

A

High frequency and energy

Lower wave length

18
Q

What are the examples of shortwave radiation

A

Visible light, UV light, x-rays and gamma rays

19
Q

Whats the highest energy form of EM radiation

A

Gamma rays

20
Q

What can gamma rays pierce

A

Atoms

21
Q

How are gamma rays produced?

A

When atoms split or fuse to another nucleus

Occurs in stars
Man made nuclear weapons and power plants

22
Q

Where do gamma rays come from

A

Super and hypernovae

23
Q

What are X-rays ideal for?

A

Medical imaging and security screening

24
Q

Where are X-rays produced?

A

Quasars and black holes

25
Q

Where is UV light produced

A

Massive stars

26
Q

What can UV rays enter

A

Skin cells

Can only pass through the first cell layers

27
Q

What does UV light produce

A

Vitamin D

28
Q

What can too much UV radiation result in

A

DNA mutation

Cancer

29
Q

What’s the wavelength of visible light

A

400-700 nanometers

30
Q

What is visible light produced by

A

Hot objects (Stars)

31
Q

What’s the most dangerous form of radiation?

A

Ionizing

32
Q

What does ionizing radiation do?

A

Separates electrons from the nucleus

33
Q

What’s are the 2 common forms of ionizing radiation

A

X-rays and gamma rays

34
Q

What does ionizing radiation cause

A

Burns, radiation sickness, cancer

Astronomy (3 decks)

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