Final answer:
The comb becomes negatively charged after rubbing it with your hair due to the transfer of electrons. Producing red light by moving the comb is not possible manually as it requires a frequency within the range of red light's frequency in the electromagnetic spectrum.
Step-by-step explanation:
When you rub a comb through your hair, electrons are transferred from your hair to the comb due to the triboelectric effect. This results in your hair becoming positively charged and the comb becoming negatively charged, because it has gained extra electrons.
Discussing how fast you would have to move the comb to produce red light involves a separate concept known as the electromagnetic spectrum and the frequency of visible light. Visible red light has a frequency of approximately 430–480 terahertz (THz). To produce light by moving an object, you would have to move it back and forth at this frequency, which is far beyond the capability of manual movement of a comb.