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Physical quantities
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size of earth
6.0×10^6
size of atom
1.0×10^10
size of radius of nucleus
1.0×10^-12
Defination: Period
the time taken for one complete oscillation
Def: scalar quantities
Physical quantity with only magnitude and no direction.
Def: Vector quantities
A physical quantity with both magnitude and direction
Def: Velocity
rate of change of direction