B, the macroscopic object's matter wave is smaller than its own size in a long term, so its fluctuation cannot be observed. Therefore, B is correct.
The scattering experiment of C and α particles is one of the simplest methods to estimate the nuclear radius, so C is correct.
D, nuclear force is a short-range strong interaction force, which can be expressed as repulsion and gravity according to the range of distance. So, d is wrong.
So choose BC.
(2) according to En= e 1n2, the energy of the nth energy level of monovalent helium ion En=? 54.4n2 .. When the energy absorbed by helium ions in the ground state is greater than or equal to 54.4eV, electrons are ionized, and the kinetic energy of moving electrons must be greater than 54.4EV..
(3)① According to the conservation of charge number and mass number,? 6429Cu→？ 6430Zn+0？ 1e，？ 6429Cu→？ 6428Ni+0 1e
② e 1 = (MCU？ mzn？ I) c2.
E2=(mcu？ mNi？ I) c2.
And △m=mZn-mNi.
Is the solution △ m = E2? E 1c2。
So the answer is: (1) BC?
(2)? 54.4n2，54.4。
(3)①? 6429Cu→？ 6430Zn+0？ 1e，？ 6429Cu→？ 6428Ni+0 1e
②△m=E2？ E 1c2。