On the definition of width in Doppler broadening problems.

[Isomorphism]

The following question has stumped me. I am not getting the answer marked. Instead I am getting option a). I have produced my attempt below.

Also I have no idea which formula to use when the question says Doppler width. Since frequencies form a distribution, there are multiple notions of width. Is there a standard notion for the term Doppler width in broadening problems?

Thanks

 

[Simon Bridge]

The following question has stumped me. I am not getting the answer marked. Instead I am getting option a). I have produced my attempt below.

Also I have no idea which formula to use when the question says Doppler width. Since frequencies form a distribution, there are multiple notions of width. Is there a standard notion for the term Doppler width in broadening problems?

You use the one most appropriate to the context.
Have you seen: http://hyperphysics.phy-astr.gsu.edu/hbase/atomic/broaden.html

 

[Isomorphism]

You use the one most appropriate to the context.
Have you seen: http://hyperphysics.phy-astr.gsu.edu/hbase/atomic/broaden.html

Yes I have. I have used that formula on the left side of my workout. The answer is not there among the options.

 

[Simon Bridge]

I see what you mean. It will have to depend on the course the test was for.