12.2Suppose 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?
Hint: The mass of the Hydrogen atom is less than the mass of the -particle.
Step 1: Compare the mass of the Hydrogen atom with the mass of the -particle.
The mass of hydrogen is less than the mass of incident -particles . Thus, the mass of the scattering particle is more than the target nucleus (hydrogen).
Step 2: Analyse the scattering angle in this case.
In the alpha-particle scattering experiment, if a thin sheet of solid hydrogen is used in place of a gold foil, then the scattering angle would not be large enough and the -particles would not bounce back if solid hydrogen is used in the particle scattering experiment.