29The reason given by Manish sir is very appropriate ...actually there is a question in NCERT Class 12th Physics textbook...chapter 12..
12.2 Suppose you are given a chance to repeat the alpha-particle
scattering experiment using a thin sheet of solid hydrogen in place
of the gold foil. (Hydrogen is a solid at temperatures below 14 K.)
What results do you expect?
Ans given..12.2
The nucleus of a hydrogen atom is a proton. The mass of it is
1.67 × 10 –27 kg, whereas the mass of an incident α-particle is
6.64 × 10–27 kg. Because the scattering particle is more massive than
the target nuclei (proton), the α-particle won’t bounce back in even
in a head-on collision. It is similar to a football colliding with a tenis
ball at rest. Thus, there would be no large-angle scattering.
