M2 part 2 Flashcards

1
Q

a giant balls mostly made of hydrogen and helium

A

stars

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2
Q

stars are mostly made of

A

hydrogen and helium

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3
Q

act as sites for nuclear reactions in the universe

A

stars

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4
Q

fuse light element to form heavier elements

A

stars

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5
Q

stars functions

A
  • act as sites for nuclear reactions in the universe
  • fuse light elements to form heavier elements
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6
Q

why are the stars so bright

A

reaction involve light emission

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7
Q

the cloud of hydrogen and helium gases
condensed to form stars

A

stellar nuclesynthesis

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8
Q

how do stars form

A

cloud of hydrogen and helium gases condensed

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9
Q

stars made of hydrogen became

A

hotter and denser

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10
Q

during the process of stellar evolution, nuclear reactions continued producing

A

elements heavier than LITHIUM

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11
Q

HOW DOES HEAVY ELEMENTS FORMED

A

combination of light elements

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12
Q

Stars much larger than our Sun can fuse

A

heavier elements from lighter elements

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13
Q

These giant stars have an

A

“onion layer” structure

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14
Q

As you proceed deeper into the star, temperatures and pressures

A

increases

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15
Q

what does fused together when you proceed deeper into the star

A

heavier nuclei

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16
Q

The heaviest element that can be made in a star is

17
Q

In the adjacent diagrams, the term “burning” really means

A

nuclear fusion

18
Q

initially fueled young stars and through nuclear reactions, new elements are formed in certain regions or layers of a star
called the fusion shells.

19
Q

new elements are
formed in certain regions or layers of a star
called the

A

fusion shells

20
Q

When most of the hydrogen in the core is
fused into helium, fusion stops and the
pressure in the core

21
Q

how does helium-hydrogen burning occurs

A

when gravity squeezes the star

22
Q

Gravity squeezes the star to a point that helium-hydrogen burning occurs. Thus, converting

A

helium to carbon

23
Q

When the majority of the helium in the core has been converted to carbon…..

A

the rate of alpha fusion processes decreases

24
Q

when does the rate of alpha fusion processes
decreases

A

majority of the helium in the core has been
converted to carbon

25
formed from carbon fusion
neon
26
formed from neon fusion
oxygen
27
formed from oxygen fusion
silicon
28
formed from silicon fusion
iron
29
layers of multiple-shell red giant
- hydrogen and helium outer envelope - helium rich, hydrogen burning shell - carbon rich, helium burning shell - oxygen rich, carbon burning shell - silicon rich, oxygen burning shell - iron rich, silicon burning inner core