In order for a substance to sustain a fission chain reaction, one ...

[clmills979]

In order for a substance to sustain a fission chain reaction, one important condition is that
 
  A) each fissioning nucleus must release a sufficient number of neutrons.
  B) the nuclei must collide with enough energy to overcome the electrical repulsion between them.
  C) each fissioning nucleus must release a sufficient number of alpha-particles.
  D) energy must be continually supplied from the outside.
  E) the nuclei must stay in shape by maintaining a regular jogging program.

Question 2

When an object 1.15 cm tall is placed 12 cm from a lens, the lens produces an upright image of the object that is 5.75 cm tall. What is the focal length of the lens?
 
  A) 24 cm
  B) 18 cm
  C) 60 cm
  D) 15 cm
  E) 9.0 cm

[medine]

Answer to Question 1

A

Answer to Question 2

D

[clmills979]

Both answers were spot on, thank you once again

[medine]

Great! Please up vote