Posted by **Susan** on Sunday, January 13, 2008 at 10:26pm.

The hydrogen atom contains a proton, mass 1.67 10-27 kg, and an electron, mass 9.11 10-31 kg. The average distance between them is 5.3 10-11 m. The charge of the proton is the same size, opposite sign of the electron.

a)What is the magnitude of the average electrostatic attraction between them?

F=kqq/d^2

You would have to convert from kg to C, correct? Then, plug everything into the formula.

b)What is the magnitude of the average gravitational attraction between them?

I am drawing a complete blank on the formula for this one and I cannot find it in my notes.

- Physics -
**Count Iblis**, Monday, January 14, 2008 at 9:47am
There are some mistakes in the problem. The average distance between the electron and the proton is not equal to 5.3 10^(-11) m. The distance

a = 5.3 10^(-11) m is the Bohr radius which and at this distance is the most likely distance for the electron to be.

The average distance is 3/2 a. In this problem you need to know the average of 1/d^2, which is given by 2/a^2. So, you need to find the charge of the electron, e, anbd evaluate:

2 k e^2/a^2

The average gravitational attraction is given by:

2 G m^2/a^2

Of course, the other mistake in this problem is that it is suggested that the average attractive force would be given by k e^2/a^2 :)

## Answer This Question

## Related Questions

- physics - An electron and a proton have charges of an equal magnitude but ...
- Physics - Could someone help me on how to put this all together. Atomic ...
- physics - A proton and an electron in a hydrogen atom are separated by a ...
- Physics Questions - Can you please help me with some and check my answers? ...
- physics - In the Bohr model of the hydrogen atom, an electon mass= 9.11 x 10^-31...
- Physics - A hydrogen atom is at the earth's surface. The electron and proton in ...
- physics - The nucleus of a hydrogen atom is a single proton, which has a radius ...
- Physics - In the hydrogen atom, the distance between the electron and the proton...
- physics - An electron and a proton are initially very far apart (effectively an ...
- physics - An electron and a proton are initially very far apart (effectively an ...

More Related Questions