I think it's one of these
a straight narrow beam of light from the sun or moon
a beam of heat, electricity, or other form of energy
ray ray
The physics definition of period is the duration of one complete cycle of a wave or oscillation.
In physics, velocity is the measurement of the rate and direction of change in the position of an object.
Wikipedia gives you a good definition and a very large list of areas.There's also the "Simple English" wikipedia.They give a very short and good definition for Physics.See http://simple.wikipedia.org/wiki/Physics
The definition of engineering physics is an introductory college course in physics for potential engineering majors. This differs from regular physics in the inclusion of calculus in the curriculum instead of just algebra.
ray ray
The physics definition of period is the duration of one complete cycle of a wave or oscillation.
Physics is the science of motion and does not have anything to do with economics.
I think you are talking about the reflected ray.
A RAY IS AN ENDPOINT OF AN ANGLE
Physics
He42 2+
In physics, velocity is the measurement of the rate and direction of change in the position of an object.
All physics deals with energy and matter. In effect that is almost a complete definition of what Physics IS.
it is the branch of physics that deals with the structure and the behaviour of an atom is called atomic physics
Wikipedia gives you a good definition and a very large list of areas.There's also the "Simple English" wikipedia.They give a very short and good definition for Physics.See http://simple.wikipedia.org/wiki/Physics
The definition of engineering physics is an introductory college course in physics for potential engineering majors. This differs from regular physics in the inclusion of calculus in the curriculum instead of just algebra.