There is not enough information to answer this - it could be anything, depending on how the particle moves.
It is the half change in velocities of the particle, which are unknown, between 3 seconds and 1 second.
crystallite is the average size of the particle whereas the particle size denotes the individual size of the particle.
It is true.
temperature
"temperature"
temperature
the same
No; it is more like a measure of the average energy per particle.
The average particle speed increases.
Yes - for example, if an object moves in a circle.
The answer will depend on its acceleration.
temperature
Average