Neutrons that will initiate the fission of U-235 require speeds ...

[Lobcity]

Neutrons that will initiate the fission of U-235 require speeds that are
 
  A) less than average.
  B) about average.
  C) more than average.
  D) all of the above
  E) none of the above

Question 2

Compared with a neutron bouncing off a carbon nucleus, a neutron bouncing off an iron nucleus loses
 
  A) less speed.
  B) more speed.
  C) the same amount of speed.

[lkanara2]

Answer to Question 1

Answer: A

Answer to Question 2

Answer: A