Which of the following happens when the frequency of electromagnetic radiation decreases?
a) The speed of the radiation decreases.
b) The wavelength of the radiation decreases.
c) The extent of the change in the electrical field at a given point decreases.
d) The energy of the radiation increases.
My first thought for this question was to refer to the equation E=hv (thats frequency, but I don't know how to type the actual symbol), but if the energy is related to the frequency, shouldn't the change be a decrease in energy? It sounds like the answer (c), but I'm not sure what (c) is referring to.