# physics

posted by .

A potential difference of 102 mV exists between the inner and outer surfaces of a cell membrane. The inner surface is negative relative to the outer surface. How much work is required to eject a positive sodium ion (Na+) from the interior of the cell? (in J)

• physics -

W = q•Δφ = 11•e•102•10^-3 =
=11•1.6•10^-19•102•10^-3=1.8•10^-19 J

## Similar Questions

1. ### physics

The inner and outer surfaces of a cell membrane carry a negative and positive charge, respectively. Because of these charges, a potential difference of about 0.070 V exists across the membrane. The thickness of the membrane is 9.00*10-9 …
2. ### physics 2

The inner and outer surface of a cell membrane carry a negative and a positive charge, respectively. Because of these charges, a potential difference of about 0.070 V exists across the membrane. The thickness of the cell membrane is …
3. ### Physics

An unknown potential difference exists between the inner and outer surfaces of the membrane of a cell. The inner surface is negative relative to the outer surface. If 2.5 x 10-20 J of work is needed to eject a positive Calcium ion …
4. ### Physics

Thank you for answering my previous questions! I have another one now in regards to the following question... An unknown potential difference exists between the inner and outer surfaces of the membrane of a cell. The inner surface …
5. ### Physics -- Repost

Homework Help Forum: Physics Posted by Sandra on Sunday, February 28, 2010 at 10:20am. Thank you for answering my previous questions! I have another one now in regards to the following question... An unknown potential difference exists …
6. ### Physics 112

The inner and outer surfaces of a cell membrane carry a negative and a positive charge, respectively. Because of these charges, a potential difference of about 0.075 V exists across the membrane. The thickness of the cell membrane …
7. ### Physics

The inner and outer surfaces of a cell membrane carry a negative and positive charge, respectively. Because of these charges, a potential difference of about 0.070 V exists across the membrane. The thickness of the membrane is 0.000000008 …
8. ### physics

A typical cell membrane is 8.0 nm thick and has an electrical resistivity of 1.3 × 107Ω.m. (i) If the potential difference between the inner and outer surfaces of a cell membrane is 75 mV, how much current ﬂows through …
9. ### physics

A typical cell membrane is 8.0 nm thick and has an electrical resistivity of 1.3 × 107Ω.m. (i) If the potential difference between the inner and outer surfaces of a cell membrane is 75 mV, how much current ﬂows through …
10. ### Physiscs 222

The inner and outer surfaces of a cell membrane carry a negative and positive charge respectively. Because of these charges, a potential difference of about 70*10-3 V exists across the membrane. The thickness of the membrane is 8.0*10-9 …

More Similar Questions