- #1

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Can anyone tell me what is the speed of light in hydrogen or may be where can I find that for all the elements.

Has these datas available already in or books.

Thanks in advance !

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- Thread starter Arnaho
- Start date

- #1

- 5

- 0

Can anyone tell me what is the speed of light in hydrogen or may be where can I find that for all the elements.

Has these datas available already in or books.

Thanks in advance !

- #2

- 35,977

- 4,686

Can anyone tell me what is the speed of light in hydrogen or may be where can I find that for all the elements.

Has these datas available already in or books.

Thanks in advance !

This is a very vague question, because it depends on the gas DENSITY. I could have only one hydrogen atom in a vacuum and the speed of light would not change by any noticeable means.

Zz.

- #3

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Thanks ! Yes of course ! Say we are in space with 1m3 of H2 trapped inside a chamber. And now if we pass the light thru it, than can we know the difference in the speed of light compared to its original ?

- #4

- 35,977

- 4,686

Thanks ! Yes of course ! Say we are in space with 1m3 of H2 trapped inside a chamber. And now if we pass the light thru it, than can we know the difference in the speed of light compared to its original ?

You've just given me the volume of the gas, not its density.

Zz.

- #5

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Thanks for your answers.

- #6

mgb_phys

Science Advisor

Homework Helper

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The refractive index increases linearly with pressure (for an ideal gas) but i don't have the constant for hydrogen

- #7

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The refractive index increases linearly with pressure (for an ideal gas) but i don't have the constant for hydrogen

Wouldn't (n-1) simply be proportional to the gas density?

- #8

mgb_phys

Science Advisor

Homework Helper

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Wouldn't (n-1) simply be proportional to the gas density?

Yes sorry, I meant (n-1) rather than n. We tend to assume (n-1) .

But the poster presumably still needs the constant.

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- #10

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If you're using 3x10

Even if you use 3.00x10

Better yet: use 2.997925x10

- #11

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Okay, Thanks !! I will try with this and let see what comes up !!

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