1. When dealing with waves in general, what is meant by the term “Ray”. 2. Gives an account of what happen when waves travel through a medium.
3. Using information from your text, differentiate between Matter and Electromagnetic Waves.
4. Describe the principle of operation of the ripple tank and how the stroboscope is used to study waves in the ripple tank.

Place several e-field sensors at a few points on different equipotential lines, and look at the relationship between the electric field and the equipotential lines. which statement is true? 1-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of higher voltages. 2-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of lower voltages. 3-at any point, the electric field is parallel to the equipotential line at that point.