Answer
Yes, it is justified.
Work Step by Step
The slowing down of gas molecules as they rise is not only negligible, but is balanced by other molecules simultaneously falling. The effects of gravity may be safely neglected.
University Physics with Modern Physics (14th Edition)
by Young, Hugh D.; Freedman, Roger A.
Published by
Pearson
ISBN 10:
0321973615
ISBN 13:
978-0-32197-361-0
Chapter 18 - Thermal Properties of Matter - Problems - Discussion Questions - Page 609: Q18.16
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