According to the kinetic theory of gases, if a molecule in a cubical container of length has a veloc — States of Matter and Gaseous State Chemistry Question
Question
According to the kinetic theory of gases, if a molecule in a cubical container of length $L$ has a velocity component $v_x$ in the x-direction, the number of collisions it makes with one specific face perpendicular to the x-axis per second is:
Answer: B
💡 Solution & Explanation
Between successive collisions with the *same* face, the molecule must travel across the box and back, covering a total distance of $2L$. Since time = distance/speed, the time between collisions is $2L/v_x$. The frequency of collisions is the reciprocal, $v_x / 2L$.
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