Ashield of material that reflects neutrons is placed around a radioactive sample.

which change in the nuclear reaction is most likely to happen?

a) a chain reaction will be sustained in a subcritical mass.

b) the chain reaction in a critical mass will stop.

c) a chain reaction will occur at a constant rate in a critical mass.

d) the chain reaction in a supercritical mass will slow down.

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c