Modern Physics
What is the primary purpose of radioactive decay?
To increase the atomic number of the nucleus.
To release energy and particles, transforming unstable nuclei into more stable ones.
To create new elements with higher mass numbers.
To absorb energy from the surroundings.
An alpha particle is equivalent to which of the following?
A single proton.
A single neutron.
A helium nucleus.
A hydrogen nucleus.
What are the charge and mass characteristics of a positron?
Negative charge, same mass as a proton.
Positive charge, much greater mass than an electron.
Positive charge, same mass as an electron.
Neutral charge, negligible mass.
Which of the following statements accurately describes the difference between neutrinos and antineutrinos?
Neutrinos have a positive charge, while antineutrinos have a negative charge.
Neutrinos are emitted in beta-minus decay, while antineutrinos are emitted in beta-plus decay.
Neutrinos are emitted in beta-plus decay, while antineutrinos are emitted in beta-minus decay.
Neutrinos have a significantly larger mass than antineutrinos.
In the alpha decay of , which of the following is the daughter nucleus?
How do the atomic number and mass number of a nucleus change after undergoing alpha decay?
Atomic number increases by 2, mass number increases by 4.
Atomic number decreases by 2, mass number decreases by 4.
Atomic number increases by 1, mass number remains the same.
Atomic number remains the same, mass number decreases by 4.
What particles are emitted during beta-minus decay?
Positron and neutrino.
Proton and neutron.
Electron and antineutrino.
Alpha particle.

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Complete the following beta-minus decay reaction:
Which particles are emitted during beta-plus decay?
Electron and antineutrino.
Proton and neutron.
Positron and neutrino.
Alpha particle.
In beta-plus decay, what is the change in the atomic number of the nucleus?
Increases by 1.
Decreases by 1.
Remains the same.
Increases by 2.