Electromagnetic Spectrum

I have a number of questions concerning the electromagnetic spectrum (ES -- see table in previous blog posting):
1) Why is it called the "electromagnetic spectrum"? How do electrons or, particularly, magnetism relate to the physics of this process?
2) What are the limits of the ES wavelengths? Can they be very large (infinite)? Can they be infinitely short?
3) Is it possible that the electromagnetic "waves" are merely the paths that their photons traverse as they oscillate (at their given frequency) orthogonal to the path of their forward motion whilst traveling at the speed of light?
4) The brightness of a light wave (or other ES wavelengths) is representative by its amplitude. Does the amplitude of ES waves change with the amount of energy injected into the photons? Can amplitudes be infinitely (or very, very) large?
5) If so, why doesn't more energy shorten the wavelength and not increase the amplitude? (Or, for that matter, why doesn't more energy produce more photons (candelas)?
6) Concerning the famous "double slit" experiment (where an interference pattern on a screen at the other side show that light exhibits wave-like behavior when passing through two slits in a shirt cardboard):
a) If one rotates the shirt cardboard 90 degrees relative to the light source will the interference pattern persist?
b) If one increases the thickness of the shirt cardboard two times, five times, a thousand times;
will the interference patterns persist?
c) Will the interference patterns persist if one uses laser (coherent) light?
d) If the slits in this cardboard are further apart than twice the amplitude of the light waves being passed through them, will interference patterns still persist?
e) How far away from the shirt cardboard can the screen be and still show the interference pattern?
7) What is the relationship between ES wavelength (or photon equivalent mass) and the (electron) characteristic of various atoms and/or molecules that cause such wavelengths to be absorbed, reflected, refracted, partially passed through (translucent), or fully passed through (transparent)? Does it relate to the ES wavelength (photon oscillation rate?) versus the oscillation rate of the electrons (quantum effect?)?
8) Assuming that the intensity (candelas for light and other ES waves too) of any ES source is representative of the number of emitted photons (per square area), at what level of intensity do photons start interfering with each other when they are emitted from a discrete point … if at all? (Could this be the corona or flash effect one sees during a total eclipse of the sun?) Is there a theoretical limit to ES intensity?
9) The "red shift" is used to calculate the speed at which stars are receding in the universe. (The speed of the receding star is said to cause its emitted light's wavelength to shift toward the longer or red side.) However, we know from Einstein, that the speed of light is absolute and does not depend on one's observation point. How do we resolve this seeming conflict? Is this supporting of the notion of ES frequency being a new dimension?
10) From the above table and the formula E=M*C**2 it is clear that photons have a different equivalent mass (the mass that would be equivalent to the indicated energy) depending on their ES frequency (larger for shorter frequencies, eg, a gamma ray photon has an equivalent mass of about 1/4 of the mass of an electron at rest, whereas a visible light photon, about 6 millionths of the mass of an electron at rest), but do the equivalent size of these photons also change with their ES frequency?