When a metal pipe is cut into two pieces, the lowest resonance frequency for the air column in one piece is 258 Hz and that for the other is 450 Hz. What resonant frequency would have been produced by the original length of pipe? Assume that the speed of sound in air is 343 m/s.

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