Semi-conductors are materials that

a. are good conductors.
b. allow electron flow and resist neutron flow.
c. have insulator and conductor properties.
d. allow neutron flow.

i think it's c.

Refer to your lab guide and review the data in table b to complete each statement. the mass of g1 + g2 after the collision kg. the velocity of g1 + g2 after the collision m/s. the momentum of the combined gliders after the collision kg · m/s.