1) Charge carriers in a metal are electrons rather than protons because electrons are

a. negative.

b. smaller.

c. loosely bound.

d. none of the above

2) A hologram is simply a

a. complex diffraction grating.

b. thin sheet of non-cubic transparent crystals.

c. pair of semi-crossed polarization filters.

d. thin photographic film with microscopic images over the entire surface.

e. none of the above.

3)A chain reaction progresses when the average number of liberated neutrons that cause further fissions is

a. zero.

b. less than one.

c. one or more.

d. none of the above

4) In practice, a good insulator

a. stops heat flow.

b. slows heat flow.

c. speeds negative heat flow.

d. all of the above