An electromagnetic wave traveling in a
vacuum has a frequency of 5 x 10 Hz,
Calculate the wavelength of this wave.
The speed of light in a vacuum is c.
a) 6,000,000m
b) om
c) 0.06m
d) 0.6m

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?