What are the two necessary conditions fo...

What are the two necessary conditions for a collision between two molecules to be effective ?

Verified by Experts

At the time of collision, (i) they should have energy more than threshold value, and (ii) they should have proper orientation.

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What is the necessary condition for rusting of iron?

Presence of O2

Presence of CO2

Absence of O2

Absence of water

the total kinetic energy of the system is always conserved.

the kinetic energy of the system before collision is equal to the kinetic energy of the system after collision.

the linear momentum of the system is conserved.

the mechanical energy of the system before collision is equal to the mechanical energy of the system after collision.

net external force is zero

the kinetic energy of the system before collision is equal to the kinetic of the system after collision.

linear momentum of system before collision = linear momentum after collision

the total energy of the system is never conserved.