Question: 4 . 2 6 . A hydrogen discharge in a 1 - T field produces a density of 1 0 1 6 m 3 .

4.26. A hydrogen discharge in a 1-T field produces a density of 1016 m
3.
(a) What is the Alfven speed vA?
(b) Suppose vA had come out greater than c. Does this mean that Alfven
waves travel faster than the speed of light?

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