Answer:
According to the Uncertainty Principle, certain physical properties cannot be simultaneously and precisely determined. Such properties include momentum or position. In general the more precisely one property of one system is known, the less precisely the other property of the same system is. It can be interpreted in two different way. One of them states that it is simply impossible to determine (measure) those two properties at the same time. The other one states that it is simply because of the nature of the system itself.