The electric field strength of a cell membrane is about 109 N/C. (charge of a proton = 1.60 10-19 C and proton mass = 1.67 10-27 kg) (a) What is the electrical force on a hydrogen ion (proton) at the membrane? (3 marks) 1.6 10-10 N 1.6 1010 N 1.6 10-28 N 1.6 1028 N (b) Calculate the acceleration of a hydrogen ion across a cell membrane. (3 marks) 9.58 1016 m/s2 9.58 1037 m/s2 9.58 10-16 m/s2z 9.58 10-37 m/s2