Answer
(b) a lower
Work Step by Step
At same temperature, the average kinetic energy of gas samples will be the same. So the gas with massive molecules will have a lower rms speed as kinetic energy is proportional to both mass and rms speed.
College Physics (7th Edition)
by Wilson, Jerry D.; Buffa, Anthony J.; Lou, Bo
Published by
Pearson
ISBN 10:
0-32160-183-1
ISBN 13:
978-0-32160-183-4
Chapter 10 - Temperature and Kinetic Theory - Learning Path Questions and Exercises - Multiple Choice Questions - Page 380: 12
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