The nuclear force between two neutrons in a nucleus is described roughly by the Yukawa potential…

The nuclear force between two neutrons in a
nucleus is described roughly by the Yukawa potential

where r is the distance between the
neutrons and U0 and r0( 10-15m)
are constants, (a) Determine the force F(r). (b) What is the ratio F(3r0)/F
(r0)? (c) Calculate this same ratio for the force between two
electrically charged particles where U(r) = C/r, with C a
constant. Why is the Yukawa force referred to as a “short range” force?