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Quarks are types of particles and a basic constituent of matter. They <span>form composite particles called hadrons when they combine.
They are fundamental components of Protons and neutrons.</span>
Newton's second law<span> of motion pertains to the behavior of objects for which all existing forces are not balanced. The </span>second law<span> states that the acceleration of an object is dependent upon two variables the net force acting upon the object and the mass of the object.</span>
Answer:
It think it's either A or D.
But I think the answer is most likely to be A because most railroad tracks aren't in tunnels and the D doesn't describe anything about tunnels.
Explanation:
The correct answer is:
<span>C. as a p-type semiconductor with the pegs representing electrons and the holes representing positive charges
</span>
The pegs represent the electrons and the holes represent the positive charges: when a peg is moved, it can be seen as an electron moving, and this peg (the electron) occupies a new hole (so, it recombines with the hole) leaving behind a free hole.
Moreover, a<span> p-type semiconductor has a larger concentration of holes than electrons, and the same is true for the puzzle (we have in fact 18 pairs of pegs-holes (electrons-holes), and then we have 2 free holes, so the concentration of holes is larger). </span>
