What evidence did wegener make use of to develop the theory of continental drift? a the climate of siberia has always been the same. b there is no evidence of glaciers anywhere in south america. c the rocky mountains are taller than the appalachian mountains. d mountains in north america appear to be part of the same chain of mountains as those in northern europe.

An alpha particle with kinetic energy 12.5 mev makes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude l = p0 b, where p0 is the magnitude of the initial momentum of the alpha particle and b=1.40×10−12 m. (assume that the lead nucleus remains stationary and that it may be treated as a point charge. the atomic number of lead is 82. the alpha particle is a helium nucleus, with atomic number 2.) what is the distance of closest approach?