NEC 215.2, 220.31, 230.42 and 310.15(B)(7) state that the neutral conductor of a residential service or feeder can than the phase conductor, but only If it can be verified that the reduction in the size of the neutral will result in a conductor capable of safely carrying the load.

This is what i found on google “according to the collision theory, the following criteria must be met in order for a chemical reaction to occur: molecules must collide with sufficient energy, known as the activation energy, so that chemical bonds can break. molecules must collide with the proper orientation.” i hope this information you.

If an object is moving or in motion

The answer is d) by requesting advice on science internet sites

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