An early model of the atom, proposed by Rutherford after his discovery of the atomic nucleus, had a positive point charge +Ze+Ze (the nucleus) at the center of a sphere of radius RR with uniformly distributed negative charge −Ze−Ze. ZZ is the atomic number, the number of protons in the nucleus and the number of electrons in the negative sphere. a. Show that the electric field inside this atom is:Em= Ze/4πeo (1/r²- r/R³) b. What is Eat the surface of the atom? Is this the expected value? Explain. c. A uranium atom has Z=92 and R: 0.10 nm. What is the electric field strength at r=1/2R.

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.