Cell membranes contain channels that allow Na + ions to rush in. Consider a channel that has a diameter of 2.56 nm and a length of 13.0 nm. If the channel has a resistance of 18.5 G Ω , what is the resistivity rho of the solution in the channel?

Two polarizers are oriented at 24.0∘ to one another. light polarized at a 12.0-degree angle to each polarizer passes through both. what is the transmitted intensity (%)?

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?

If the new moon happens on january 15th, what shape will it be on february 6th?