Question

8. a. Give one reason for each of the following with reference to Rutherford's alpha-panicle 3
scattering experiment:
. Most of the fast moving alpha particles passed straight through the gold foil
1. Surprisingly one out of every 12000 particles appeared to rebound,
bon the basis of Thomson's model of an atom, explain how the atom is neutral as a whole?
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Answer 1

Answer:

The reasons for the above mentioned observations of alpha particle scattering experiment are:

• Most of the fast moving alpha particles passed straight through the gold foil, because most of the space inside and atom is empty.
• Surprisingly, one out of every 20,000 particles, appeared to rebound by almost 180°, because most of the mass and the positive charge of an atom is concentrated in a very small region called Nucleus, within the atom. Whenever a particle hit at the Nucleus, the positive charge repulsion would be so strong that it was made to rebound by 180°.