Choose the correct statements:

A. $\alpha$-particle close to the nucleus suffers large scattering.
B. Hydrogen atom consists of a single proton and a single neutron.
C. Chadwick discovered neutron.
D. In $\gamma$-decay, photons are emitted.
E. The nucleus force between two nucleons falls rapidly to zero as their distance is less than a few femtometers.

Choose the correct answer from the options given below:

A, C and D only

The correct answer is Option (3) → A, C and D only

(A) When $\alpha$-particle (Helium Nuclei) pass closed to positively charged nucleus, they experience a large coloumb repelsion, causing significant scattering.

(C) James Chadwick discovered the neutron in 1932 through experiments involving beryllium and alpha particle.

(D) During Gamma decay, a nucleus in excited state emits high energy photons ($\gamma$-rays) to release excess energy.