39Alpha particles are moving too fast to actually interact with electrons(as per Rutherford's experiment), and mass of electrons is negligible as Manish sir says. Thus a),c).
Q1 When alpha particles are sent through thin metal foil,most f them go straight through becoz
a)alpha particles are heavier than electrons
b)alpha particles are positively charged
c)most space of atom is empty
d)alpha particles move with high velocity
ans given is a,c....but why a??
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4 Answers
1357maybe because, if alpha particle collides with an electron, it still moves in the same direction with less velocity
39
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.
