Henri Becquerel : (Multiple Choice)

Henri Becquerel
 
  A) discovered radium and polonium.
  B) discovered radioactivity.
  C) observed back-scattering from nuclei.
  D) invented the particle detector tube.
  E) proposed the tiny central nucleus idea.

Question 2

Which uranium isotope has the largest cross section for slow neutrons?
 
  A) U-236
  B) U-238
  C) U-237
  D) U-235
  E) U-239

Question 3

Marie & Pierre Curie
 
  A) discovered radioactivity.
  B) proposed the plum-pudding model.
  C) proposed the tiny central nucleus idea.
  D) observed back-scattering from nuclei.
  E) discovered radium and polonium.

Question 4

Which Uranium isotope is the most commonly occurring isotope?
 
  A) U-235
  B) U-236
  C) U-237
  D) U-238
  E) U-239

Question 5

When a + particle is emitted from an unstable nucleus, the atomic number of the nucleus
 
  A) increases by 1.
  B) does not change.
  C) decreases by 1.
  D) increases by 2.
  E) decreases by 2.

Question 6

When a neutron is emitted from an unstable nucleus, the atomic mass number of the nucleus
 
  A) does not change.
  B) decreases by 2.
  C) decreases by 1.
  D) increases by 2.
  E) increases by 1.