Children have about 1016 synapses that can transfer signals between neurons in the brain and between neurons and muscle cells. suppose that these synapses simultaneously transmit a signal, sending 1000 calcium ions (ca2+) across the membrane at each synaptic ending. determine the total electric charge transfer in coulombs during that short time interval. by comparison, a lightning flash involves about 5c of charge transfer. (note: this is a fictional scenario. all human neurons do not simultaneously produce signals.) e=1.6×10−19c.
there are more correct choices on the list than incorrect ones.
the inverse square law applies to
-- the intensity of sound from a small source
-- the gravitational force
-- the intensity of light from a small source
-- the electric force from a point charge or a small charge.
it doesn't apply to the magnetic force.