Question

Under certain circumstances, potassium ions K++ move across the 8.0-nm-thick cell membrane from the inside to the outside. The potential inside the cell is -80.0 mV, and the potential outside is zero. Assume that a potassium ion carries a charge of 1.602××10−19−19 C.

Unit 3: Prelecture Problems Problems: Electric Potential & Capacitor Deadline: 100% until Sunday, January 27 at 11:59 PM ▼ Cumulative Problem 6 Under certain circumstances, potassium ions K+ move across the 8.0-nm-thick cell membrane from the inside to the outside. The potential inside the cell is-80.0 mV, and the potential outside is zero. Assume that a potassium ion carries a charge of 1.602x1019 C 1) What is the change in the electrical potential energy of the potssium ions as they move across the membrane? (Express your answer to three significant figures.) X10-20 J Submit You currently have 0 submissions for this question. Only 10 submission are allowed. You can make 10 more submissions for this question. 2) Does their potential energy increase or decrease as they move from the inside to the outside? increase decrease You currently have 0 submissions for this question. Only 10 submission are allowed. You can make 10 more submissions for this question.

Answer 1

Concept used:- first we find the potential difference and use it to find potential energy change as follows:

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Concept used: - first we find the potential difference and use it to find potential energy change as follows: delta v = q delta v = q(v_2 -v_1) = (1.602 times 10^-19 c)(0-(-80mv)) = 1.28 times 10^-20 J potential increases