A molecule in a cube of length math xmlns=http://www.w3.org/1998/Math/MathMLmil/mi/math has a ve...

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A molecule in a cube of length math xmlns=http://www.w3.org/1998/Math/MathMLmil/mi/math has a velocity math xmlns=http://www.w3.org/1998/Math/MathMLmsubmiv/mimix/mi/msub/math in the math xmlns=http://www.w3.org/1998/Math/MathMLmix/mi/math direction. The number of collisions with one face per second for this molecule with be given by which one of the following :
(A) math xmlns=http://www.w3.org/1998/Math/MathMLmfracmiv/mimil/mi/mfrac/math
(B) math xmlns=http://www.w3.org/1998/Math/MathMLmfracmiv/mimrowmn2/mnmil/mi/mrow/mfrac/math
(C) math xmlns=http://www.w3.org/1998/Math/MathMLmfracmn1/mnmrowmn2/mnmil/mi/mrow/mfrac/math
(D) math xmlns=http://www.w3.org/1998/Math/MathMLmfracmrowmiN/mimim/mimsupmiv/mimn2/mn/msup/mrowmrowmn3/mnmil/mi/mrow/mfrac/math
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