$A$ parallel beam of particles of mass $m$ moving with velocity $v$ impinges on $a$ wall at an angle $\theta$ to its normal . The number of particles per unit volume in the beam is $n$ . If the collision of particles with the wall is elastic, then the pressure exerted by this beam on the wall is :
$A$ parallel beam of particles of mass $m$ moving with velocity $v$ impinges on $a$ wall at an angle $\theta$ to its normal . The number of particles per unit volume in the beam is $n$ . If the collision of particles with the wall is elastic, then the pressure exerted by this beam on the wall is :
- A
$2 \,mn\, v^2\, cos\, \theta$
- B
$2\, mn\, v^2 \,cos^2\, \theta$
- C
$2\, mn\, v \,cos\, \theta$
- D
$2\, mn\, v\, cos^2\, \theta$
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