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I have a question about the relationship between kinetic energy and temperature for the hydrogen.

In my professor's note, there is written that:

(1/2)m*(v^2) = (1/2)*K*T

where m is the mass, K the costant and T the temperature in Kelvin.

My doubt is in the fact that on internet I discovered that the relation is:

(1/2)m*(v^2) = (3/2)*K*T

so are my professor's notes wrong?