Answer:
They are all physical exept c
Explanation:
Answer: A boron atom has 2 electrons at the first energy level and 3 electrons at the second energy level.
<u>Answer:</u> The uncertainty in the velocity of oxygen molecule is 
<u>Explanation:</u>
The diameter of the molecule will be equal to the uncertainty in position.
The equation representing Heisenberg's uncertainty principle follows:

where,
= uncertainty in position = d = 
= uncertainty in momentum = 
m = mass of oxygen molecule = 
h = Planck's constant = 
Putting values in above equation, we get:

Hence, the uncertainty in the velocity of oxygen molecule is 
Answer:
kinetic energy
Explanation:
because of the movement of gravity and space