The length of an axon is 10 mm, and its time constant is 4 msec. a voltage change at one end of the axon is 120 mv, which results in a change of about 10.35 mv at the opposite end after 4 msec. given this information, what is the length constant of the neuron? ( input answer in mm, rounded to the nearest whole number, without including the units.)
2) if the diameter of an axon is decreased, and the amount of ion channels stays the same causing membrane resistance to be largely unchanged, what would happen? (state all that apply.)
the length constant increases.
the length constant decreases.
the time constant increases.
the time constant decreases.

Search coils and credit cards. one practical way to measure magnetic field strength uses a small, closely wound coil called a search coil. the coil is initially held with its plane perpendicular to a magnetic field. the coil is then either quickly rotated a quarter-turn about a diameter or quickly pulled out of the field. (a) derive the equation relating the total charge q that flows through a search coil to the magnetic-field magnitude b. the search coil has n turns, each with area a, and the flux through the coil is decreased from its initial maximum value to zero in a time ∆t. the resistance of the coil is r, and the total charge is q = i∆t, where i is the average current induced by the change in flux. (b) in a credit card reader, the magnetic strip on the back of a credit card is rapidly “swiped” past a coil within the reader. explain, using the same ideas that underlie the operation of a search coil, how the reader can decode the information stored in the pattern of magnetization on the strip. (c) is it necessary that the credit card be “swiped” through the reader at exactly the right speed? why or why not?

What is the freezing point of radiator fluid that is 50% antifreeze by mass? kf for water is 1.86 ∘c/m.

At what time will the interfering waves have an amplitudeof zero?