Three groups of drugs are used to reduce the stickiness of platelets, thus preventing platelets from clumping together to form platelet plugs. The anti-platelet drugs are most effective in preventing abnormal blood clots from forming in arteries (as opposed to veins). Aspirin and dipyridamoleâ (Aggrenox).
In order to react, colliding molecules must have a total kinetic energy equal to or greater than some minimum value [Figure 14.13(b)]. The minimum energy required to initiate a chemical reaction is called the activation energy, Ea. The value of Ea varies from reaction to reaction.
The minimum frequency of light needed to eject electrons from a metal is called the threshold frequency, Î½0. [From: ] [author: ] [Date: 13-11-05] [Hit: ]. 78Ã10^14 = 1.Planck constant h = 6.626Ã10^-34 J sc = speed of light = 3.E (6.626Ã10^-34)Ã(3.00Ã10^8)/(245Ã10^-9) = 8.......