The ____ is a line drawn at a right angle to a barrier. a. normal c. node b. ray d. wave front
1 answer:
Answer:
a. normal
Explanation:
In the field of physics the normal is a line drawn at a right angle to a barrier. In other words the normal line is the line that is drawn perpendicular (right angle, 90 degrees) to the reflective surface of a mirror, or the particular boundary in which refraction occurs at the point of incidence of a light ray. This can be seen in the picture attached below.
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p = 150+172
If the mass of the electrons is
And the mass of the protong is
We have that the total mass of the system would be