Askipper on a boat notices wave crests passing the anchor chain every 5 seconds. the skipper estimates the distance between crests is 15 m. what is the speed of the water waves?

Because the crests occur every 5 seconds, the period is
T =  5 s.
By definition, the frequency is
f = 1/T = 1/5 = 0.2 Hz

The distance between crests is 15 m, therefore the wavelength is
λ = 15 m

By definition, the velocity, v, is
v = fλ
   = (0.2 1/s)*(15 m)
   = 3 m/s

  3 m/s

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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 -