According to the Doppler effect, which of the following would increase the observed frequency of a wave? A. a source moving towards the observer
B. a source moving away from the observer.
C. no relative motion between the wave source and observer.
D. an observer moving away from the source of a wave

Ithink d is the right answer. hope this !

Iread this book last year so take this with a grain of salt.gene jumps from the tree to compete with finny due to the fact that gene is always trying to do better than finny. he is put under the grasp of peer pressure due to finny almost forcing him to do this. ever since he first jumped finny kept pressuring him to jump since he thought gene enjoyed jumping.rather than uses this answer you should probably just reread chapters 3-4

An atom that has fewer electrons that protons is called a positive ion.