3. (a) What are the assumptions behind Maxwell's theory of electromagnetism? (b) What are Maxwell's equations? (c) What is an electromagnetic wave? (d) Draw a visual representation of an electromagnetic wave. (e) What is the speed of an electromagnetic wave? (f) What is an electromagnetic spectrum? (g) List the types of radiation that make up the electromagnetic spectrum (h) Give the wavelength and frequency corresponding to each type of radiation listed in (g). (i) Give one application of each type of radiation in the electromagnetic spectrum