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Question

Identify the correct labels of A,B and C in the following graph from the options given below:
Root mean square speed (urms); most probable speed (ump); Average speed (uav)


A
Aump;Buav;Curms
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B
Aump;Burms;Cuav
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C
Auav;Burms;Cump
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D
Aurms;Bump;Cuav
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Solution

The correct option is A Aump;Buav;Curms
uav=8RTπM, urms=3RTM
ump=2RTM
Ratio of the speeds are:
urms;uav;ump=1.22:1.12:1
urms is greater magnitude than uav and ump is smallest in magnitude.
Therefore correct option is (a) i.e. Aump;Buav;Curms



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