A curium-242 (Z= 96) can be produced by positive-ion bombardment when an alpha particle collides with which of the following nuclei? Note: A neutron is also a product of this bombardment, in addition to the curium-242. A. Pu -239

B. U -239

C. Am-241

D. Cf-249

E. Pu-241

What are the factors that affect the resistance of a wire?

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration