This question can likely be answered using the formula E=hc/w where w is wavelength, h is Planck's constant, c is the speed of light, and E is energy in Joules. 5 electrons are emitted when calcium is flashed with light of wavelength 340 nm and intensity of 50 percent.
Remove the hog-rings as you roll the cover up over the seat. If your seat has a hard back, there will be a series of screws along the bottom that hold the bottom of the hard back to the seat. Unscrew these, and then pull open the hard back slightly to determine if the hardback needs to be slid up or down to be removed.
Put on work gloves and protective eye goggles. Place a high-quality wire brush attachment on the drill, and work it over all of the rusty areas on the metal gate. The wire attachment should strip all of the rust off the gate. Be sure to work between the bars and into all nooks and crannies until the rust is removed. This can be a tedious process.