0
Why is the H alpha absorption line of hydrogen in the sun relatively weak even though the Sun has abundant hydrogen?
Good question. It's because of the Sun's temperature. H-alpha is the line produced from exciting an electron from n=2 to n=3 level. Note that to be able to absorb H-alpha, you would need to have a hydrogen atom with its electron already in the n=2 excited state! Exciting n=1 to n=2 (Lyman-alpha) takes a lot of energy, much more than n=2 to n=3, and the Sun's photosphere is not hot enough for much of its hydrogen to be in the n=2 excited state. Hotter stars have more hydrogen in the n=2 state, so it is then easy to do the (less energetic) n=2 to n=3 H-alpha absorption. That's why hotter stars like A stars have much stronger H-alpha lines.
Note that stars hotter than A stars (O,B) again have weak hydrogen absorption lines, because they are so hot most of their hydrogen is ionized, and again there is not much hydrgoen in the n=2 state to excite.
What else can I help you with?
What is the predominant material of the sun?
The predominant material of the Sun is hydrogen, which makes up about 74% of its mass. Helium is the next most abundant element, making up about 24% of its mass. Other elements such as oxygen, carbon, neon, and iron make up the remaining 2%.
Is there nitrogen in outer space?
Yes, nitrogen is present in outer space, but it is very sparse compared to other elements. It can be found in the atmospheres of some planets and in interstellar clouds, but it is not nearly as abundant as elements like hydrogen and helium.
Are glow in the dark rosaries safe?
They are relatively safe, though they likely use a lightly radioactive substance like radium.
What is the most abundant metal in earth?
Aluminum is the most abundant metallic element on Earth. It makes up more than eight percent of the earth's crust. Though, it is never free in nature. It combines with oxygen, sand, iron and titanium, and its ores are mainly bauxites.
Why are the supergiant stars so bright even though they are not very hot?
A relatively low surface temperature means that reg giants radiate relatively little energy per area unit, but since they have a very large surface area, the total amount of energy radiated is enormous.
Is economics inrelevant in absence of scarcity?
Scarcity is a relative aspect. Consider there is 'abundant' X and also 'abundant' Y but the consumer has to decide how much Income (Income may also be considered abundant) to allocate between X and Y (Now though both abundant they may be relatively scarce i.e. when compared to each other), and this is done from his perception of utility which is an economic concept. So economics is also the study of optimal allocation, in scarce or abundant scenario.
How do you extract hydrogen from air?
Hydrogen cannot be directly extracted from air because it is not abundant in the Earth's atmosphere. Instead, most hydrogen is produced from natural gas, water, or other hydrocarbons through processes such as steam methane reforming, electrolysis of water, or coal gasification. These methods are more efficient and cost-effective for industrial-scale hydrogen production.
The big 4 elements in the body?
The four most abundant elements in the human body are oxygen, carbon, hydrogen, and nitrogen. Together, they make up about 96% of the body's mass.
Does the action and absorption spectrum have to be the same?
No, though I can't think why and what the 'action' might be.
How do you catch slowking in Pokemon white?
By surfing at the Abundant Shrine. It is incredibly rare though.
Is the tango a formal dance?
relatively even though it is akward!!
What are the most abundant compounds in the Earth's atmosphere?
Water is the usually the most abundant compound in the air, though the amount varies. It can be up to 4%. Next is carbon dioxide at 0.04%.
What are the Covalent compound of sulphur and hydrogen?
Hydrogen sulfide (H2S) is the most common example, though hydrogen disulfide (H2S2) also exists.
Are all deficient numbers odd numbers?
no, 945 is the first abundant odd number though
What is the predominant material of the sun?
The predominant material of the Sun is hydrogen, which makes up about 74% of its mass. Helium is the next most abundant element, making up about 24% of its mass. Other elements such as oxygen, carbon, neon, and iron make up the remaining 2%.
Can a rational number sometimes be an integer?
Yes, though relatively rarely.
Why is water and hydrogen peroxide different even though they are made of the same types of atoms?
hydrogen has two hydrogen atoms and two oxygen atoms and water has one hydrogen and one oxygen atoms
