Question

I have biology hmwk that's kind of like chemistry I guess..Distant Galaxy Spectrums and I really really need help!:( (pictures)

Answer 1

@thomaster Can u help her out?

Answer 2

^ Please

Answer 3

actually this is physics...

Answer 4

I dont really know..Im in biology but its probably like a review because today was my 3rd day already-_-

Answer 5

I'd post this in the chemistry section (since it's about hydrogen emission). Or physics.

Answer 6

But can you still help me?
Or you don't get it?

Answer 7

Cosmology 100% physics.

Answer 8

@Juliaxo9 sorry I could help you but I'd have to dig some deeper in this stuff and i don't have time for that now :(

Answer 9

Alright and what about @Frostbite ?

Answer 10

I'm trying to find my old Cosmology books... might be something there...

Answer 11

Okay while you do that I will ask more people:)

Answer 12

I'm not sure I get the bigger idea. I mean if we make emission spectrum then it is just the lines which are not there in the absorption spectrum.

Answer 13

But I know what we can conclude from the Doppler effect...

Answer 14

Okay:)

Answer 15

The Doppler effect can be related to redshift.
Redshift is a phenomenon that when things move away from us they emit red light. The more red it become (wavelength increase) the further away it is.

Answer 16

It will explain why the lines are moving:

Answer 17

And also would you know how to do the chart thing? From #1?

Answer 18

Yea I'm not sure I see the idea in it... I mean do they just want you to place them all in one emission spectrum?

Answer 19

I think so but what is that? :0

Answer 20

The same they did:

But I don't see the big idea.
@aaronq how is your Cosmology dude?

Answer 21

Alright now Im going to wait for @aaronq :p

Answer 22

The chart @Frostbite drew looks right. What he said for 2. is definitely right.

Answer 23

I found it on google but idk what to fill in

Answer 24

Im going to draw what @Frostbite drew too..but do I need to label anything?

Answer 25

Label what the different emission lines refer to. I got to think about this... this just... seem to weird or perhaps I'm over doing it?

Answer 26

I think both ways work, if you either make a linear chart (what Frostbite drew) or a chart (table) like you posted.

You do need to include the things they asked you for, like wavelength, distance and name of the galaxy or whatever

Answer 27

How do I know the wavelenght?

Answer 28

So like 21.00cm for milky way?

Answer 29

the 21.00 cm is the wavelength yea.

Answer 30

and distance is like A few light yrs for milky way?

Answer 31

sorry, i read wrong, you don't need to include the distance.

Answer 32

or at least it doesn't say that in your question.

Answer 33

Okay thank you everyone!!!:)

Answer 34

@Frostbite "The more red it become (wavelength increase) the further away it is."

Umm - no. Red Shift doesn't have to do with distance, it has to do with relative velocity. The more red it is, the faster it's moving away from us.