Question

1. what does heisenbergs principle of uncertainty state about the position and velocity of an electron?

only one can be measured with some level of certainty at a given time.
both can be measured with a high level of certainty at the same time.
both can be measured with a low level of certainty at the same time.
neither can be measured with any level of certainty at the same time.

Explanation:

Heisenberg's Uncertainty Principle states that it is impossible to simultaneously measure the exact position and exact velocity (or momentum) of an electron. If one quantity is measured with high certainty, the other will have a large uncertainty. So, only one can be measured with some level of certainty at a given time.

Answer:

Only one can be measured with some level of certainty at a given time.