Nerve cells transmit electric signals through their long tubular axons. These signals propagate due to a sudden rush of Na+ ions, each with charge +e, into the axon. Measurements have revealed that typically about 5.7×10^11 Na+ ions enter each meter of the axon during a time of 7.0 ms. What is the current during this inflow of charge in a meter of axon?

Explanation:

For this case we have the following info given:

Number of Na+ ions

Each ion have a charge of +e and the crage of the electron is

The time is given if we convert this into seconds we got:

Now we can use the following formula given from the current passing thourhg a meter of nerve axon given by:

Where N represent the number of ions, e the charge of the electron and Q the total charge

If we replace on this case we have this:

And from the general definition of current we know that:

And since we know the total charge Q and the time we can replace:

The current during the inflow charge in the meter axon for this case is

second mirror gathers light from a faraway object and reflects it to another mirror. - a.