Equal volumes of \( \mathrm{SO}_{2} \) and He at a temperature \( T \) and pressure \( p \) are ...

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Equal volumes of \( \mathrm{SO}_{2} \) and He at a temperature \( T \) and pressure \( p \) are allowed to effuse through a hole. The rate of effusion of helium is
(A) equal to the rate of effusion of \( \mathrm{SO}_{2} \).
(B) four times the rate of effusion of \( \mathrm{SO}_{2} \).
(C) half of the rate of effusion of \( \mathrm{SO}_{2} \).
(D) twice the rate of effusion of \( \mathrm{SO}_{2} \).
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