Which of the following matches a quadrilateral with the characteristics listed
below?
1. Four right angles
2. Both pairs of opposite sides parallel and congruent
3. All 4 sides not congruent

Lexy is correct because angle r is between the incident wave,  n  = 0, and a diffracted wave.

In atoms, the electron carries a negative elementary or unit charge; the proton carries a positive charge. the two types of charge are equal and opposite. in an atom of matter, an electrical charge occurs whenever the number of protons in the nucleus differs from the number of electrons surrounding that nucleus.

Electrical charge is measured in coulomb.(c). the amount of an electrical charge that moves in a circuit depends on the current flow and how long it flows for. a current of 10 a flows for 30 s,then 10 x=300 coulombs of electrical charge moves