A beam cannot have a thinner diameter than its wavelength since 1: it CAN have a thinner diameter
2: Huygens principle will no longer apply
3: it depends on the wavelength
4: the wavelets are unable to interfere destructively outside the beam
5: the wavelets cannot interfere constructively in front of the beam
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Diffraction occurs
1: for light waves only
2: only in three dimensions
3: only for thin enough objects
4: only at certain speeds
5: for objects larger than the
wavelength of the wave
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An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -