 |
Figure 15-01 shows the size of those systems, which are governed by the rules in quantum theory. The deterministic property of classical physics is replaced by uncertainty for objects of such small size. Only the probability of certain quantities and processes can be estimated in this domain. It starts from molecule with a size of about 10-7cm to the hypothetical entity of string and membrane, which has a size of only 10-33cm. The size of the macro-molecules varies, the length of DNA can be up to 10 cm in human chromosom; while the width of the base pair is only 2x10-7 cm. The diagram also shows a proton composed of two up quarks and one down quark. According to the superstrings theory, these quarks are string or string attached to a membrane at the scale of less than 10-33cm, which is called the Planck scale - the smallest meaningful size (see Realm of Planck Scale).
|