Non metal ions gain electrons to become negative ions
Answer:
Explanation:
Given that,
Width of a one dimensional potential box, 
The energy of a particle in one dimensional box is given by :
h = Planck's constant
m = the mass of the proton
For minimum kinetic energy, n = 1
So, the minimum kinetic energy of the neutron is 
. Hence, this is the required solution.
Answer: 4.speed
Explanation:
In this case, we know that the cart remains at a constant 20km/h.
Now, one could say that "the velocity remains constant, because it always is 20km/h"
But remember that velocity is a vector, so this has a direction, and if the cart is going around a turn, then the direction of motion is changing, which tell us that there is acceleration.
But the module of the velocity, the speed, remains constant at 20km/h.
Then the correct option is 4, speed.
