Which of the following statements are true concerning planck's quantum hypothesis? check all that apply. check all that apply. a lower limit is set on the amount of energy that can be absorbed or emitted in oscillations. an upper limit is set on the amount of energy that can be absorbed or emitted in oscillations. the energy of the oscillations of atoms within molecules must be quantized. the energy of the oscillations of atoms within molecules can have any value.

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.