(part 1 of 2) A neutron in a reactor makes an elastic head on collision with the nucleus of an atom initially at rest.
Assume: The mass of the atomic nucleus is
about 14.7 the mass of the neutron.
What fraction of the neutron's kinetic energy
is transferred to the atomic nucleus?
1. 0.238549
2. 0.298761
3. 0.271318
4. 0.286041
5. 0.256837
6. 0.290161
7. 0.29141
8. 0.211115
9. 0.270659
10. 0.253598

(part 2 of 2)
If the initial kinetic energy of the neutron is
4.42 x 10^-13 J. find its final kinetic. energy.

Uranium has two naturally occurring isotopes. 238u has a natural abundance of 99.3% and 235u has an abundance of 0.7%. it is the rarer 235u that is needed for nuclear reactors. the isotopes are separated by forming uranium hexafluoride uf6, which is a gas, then allowing it to diffuse through a series of porous membranes. 235uf6 has a slightly larger rms speed than 238uf6 and diffuses slightly faster. many repetitions of this procedure gradually separate the two isotopes. what is the ratio of the rms speed of 235uf6 to that of 238uf6? express your answer to five significant figures.