Exposure to the very high intensity electromagnetic fields found in the immediate vicinity of certain sources such as radar installations and TV or radio transmitters can produce electrical shock or a variety of heating effects, which may range from a sensation of warmth to burns and eventual cataract formation.
S 1 is a vertical, perfectly inelastic, supply curve. This represents 'momentary' supply. In most industries, if a firm was asked to produce a large order immediately, it simply would not be able to do it, regardless of the price offered for the order. Supply is perfectly inelastic in the very short run.
Elasticity of demand = % change in quantity demanded / % change in price. It is not to be confused with the slope of the demand curve. The slope of the demand curve remains constant; however, the elasticity of the demand curve changes as you move along. The only curve that has a constant inelastic demand is a vertical demand curve. Any change in price will result in no change in quantity demanded.