
(a)
Interpretation:
The number of beta particles taken to make up the mass of an alpha particle is to be calculated.
Concept introduction:
An alpha particle has two neutrons and two protons; so it’s mass is the sum of masses of protons and neutrons. On the other hand, the beta particle has only one electron. Thus its mass is same as the mass of electron. Helium is taken as alpha particle while electron is the beta particle.
(b)
Interpretation:
Whether an alpha particle or a beta particle of the same kinetic energy has faster moving radioactive emission is to be stated.
Concept introduction:
The alpha particle has two neutrons and two protons; so it’s mass is the mass of proton and neutron. On the other hand, the beta particle has only one electron. Thus its mass is same as the mass of electron. Helium is taken as alpha particle while electron is the beta particle.
(c)
Interpretation:
The justification for answer to part b with the experimental observation that beta particles are more penetrating than alpha particles is to be stated.
Concept introduction:
The alpha particle has two neutrons and two protons; so it’s mass is the mass of proton and neutron. On the other hand, the beta particle has only one electron. Thus its mass is same as the mass of electron. Helium is taken as alpha particle while electron is the beta particle.

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Physical Chemistry
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