Question

In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below
Assertion (A) : It is impossible to determine the exact position and exact momentum of an electron simultaneously.
Reason (R) : The path of an electron in an atom is clearly defined.
(i) Both A and R are true and R is the correct explanation of A.
(ii) Both A and R are true and R is not the correct explanation of A.
(iii) A is true and R is false.
(iv) Both A and R are false.

Answer 1

A is true and R is false.

This is according to the uncertainty principle of Heisenberg.  The momentum and positions can be determined to be with in a range with some probability.

The exact position and the corresponding exact momentum can be determined with zero probability.  If the position can be determined with higher precision, then the momentum can be determined with less precision.