Calculate the electric force an electron exerts upon a proton inside a he atom if they are d=2.7⋅10^-10m apart.
hint: fe=k⋅qp⋅qp/d^2 where k=9⋅10^9.
a) 6.8e-8n;
b) -212.7e-9n;
c) -6.31e-9n;
d) -57.6e-10n;

Explanation:

Charge of electron in He,

Charge of proton in He,

Distance between them,

We need to find the electric force between them. It is given by :

Since, there are two protons so, the force become double i.e.

So, the correct option is (c). Hence, this is the required solution.

you would expect a sound wave to speed up. - b)

0.19 m/s and 0.45 m/s