The temperature of an ideal gas is increased from $120 \,K$ to $480 \,K$. If at $120 \,K$,the root mean square speed of gas molecules is $v$,then at $480 \,K$ it will be

  • A
    $4 v$
  • B
    $2 v$
  • C
    $\frac{v}{2}$
  • D
    $\frac{v}{4}$

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For a gas at a temperature $T$,the root-mean-square velocity ${v_{rms}}$,the most probable speed ${v_{mp}}$,and the average speed ${v_{av}}$ obey the relationship:

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