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.
Hook the new J-hooks together, and set it aside. Now, remove the cover on the backrest. Around the perimeter of the backside of the seat, there are hog-rings that attach the factory cover to the foam. Snip the hog-rings and then roll the cover off the foam to reveal the insert hog-rings. Snip these hog-rings and the cover should fall off of the foam.