An atomic nucleus contains Z protons. It has a total charge Q = 3.2 x 10-19 C.

1)Calculate Z. Z =

2)What is the magnitude of the electric field at a radius a = 1.48 x 10-11 m from the center of this nucleus? E = x 1012 N/C

3)A single electron, charge q = -1.6 x 10-19 C and mass m = 9.11 x 10-31 kg moves around the nucleus in a circular orbit at the radius a. Calculate the orbital speed of the electron. v = x 107 m/s

4)The speed of light, c is 3 X 108 meters/sec. What is the ratio of the calculated speed for the electron to the speed of light. v/c =

 

a