Cell Membrane Resistance The capacitance of biological membranes is about 1.0 μ F per cm 2 of membrane area, so investigators can determine the surface area of a cell membrane by using intracellular electrodes to measure the membrane’s capacitive reactance. An investigator applies a 1.0 μ A peak current at 40 kHz to a cell and measures the peak out-of-phase voltage—that is, the component of the voltage due to the capacitive reactance of the cell membrane—to be 0.16 V. If the frequency is doubled to 80 kHz and the current is kept the same, what will be the peak out-of-phase voltage? A. 0.32 V B. 0.16 V C. 0.080 V D. 0.040 V
Cell Membrane Resistance The capacitance of biological membranes is about 1.0 μ F per cm 2 of membrane area, so investigators can determine the surface area of a cell membrane by using intracellular electrodes to measure the membrane’s capacitive reactance. An investigator applies a 1.0 μ A peak current at 40 kHz to a cell and measures the peak out-of-phase voltage—that is, the component of the voltage due to the capacitive reactance of the cell membrane—to be 0.16 V. If the frequency is doubled to 80 kHz and the current is kept the same, what will be the peak out-of-phase voltage? A. 0.32 V B. 0.16 V C. 0.080 V D. 0.040 V
The capacitance of biological membranes is about 1.0 μF per cm2 of membrane area, so investigators can determine the surface area of a cell membrane by using intracellular electrodes to measure the membrane’s capacitive reactance. An investigator applies a 1.0 μA peak current at 40 kHz to a cell and measures the peak out-of-phase voltage—that is, the component of the voltage due to the capacitive reactance of the cell membrane—to be 0.16 V.
If the frequency is doubled to 80 kHz and the current is kept the same, what will be the peak out-of-phase voltage?
suggest a reason ultrasound cleaning is better than cleaning by hand?
Checkpoint 4
The figure shows four orientations of an electric di-
pole in an external electric field. Rank the orienta-
tions according to (a) the magnitude of the torque
on the dipole and (b) the potential energy of the di-
pole, greatest first.
(1)
(2)
E
(4)
What is integrated science.
What is fractional distillation
What is simple distillation
Chapter 26 Solutions
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