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Radioactive Decay and Half-life Modeling

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Radioactive Decay and Half-life Modeling

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Questions and Answers

What is the primary reason why a nucleus might become unstable?

Having too many neutrons (correct)

Receiving external pressure

Being exposed to sunlight

Having too few protons

In beta-minus emission, what changes in the nucleus?

A positron changes into an electron

A proton changes into a neutron

A neutron changes into a proton (correct)

An electron changes into a positron

Which force causes protons to experience repulsion in the nucleus?

Weak nuclear force

Electromagnetic force (correct)

Gravitational force

Strong nuclear force

What is the common product of beta-plus decay and electron capture?

Neutron (D) Signup and view all the answers

How does the nucleon number change during beta-minus emission?

Remains constant (B) Signup and view all the answers

Why must nuclei with long half-lives be suitably stored?

To prevent damage to the environment (D) Signup and view all the answers

What factor allows the decay constant to be used to model the decay of a large sample of nuclei?

The number of nuclei in the sample (C) Signup and view all the answers

How does the half-life of a radioactive nucleus impact its use in dating organic objects?

It establishes a correlation between current and initial amounts of the nucleus (D) Signup and view all the answers

Which feature makes Technetium-99m ideal for medical diagnosis as a radioactive tracer?

Its gamma emission and short half-life (A) Signup and view all the answers

In radioactive dating, why is it important to compare the current amount of a radioactive isotope with its initial amount?

To estimate the age of the object being dated (C) Signup and view all the answers

Which parameter has a direct relationship with the activity of a radioactive sample?

Decay constant (B) Signup and view all the answers

How does the decay constant contribute to modeling the decay process in a large sample of nuclei?

By providing a measure of how fast nuclei decay statistically (D) Signup and view all the answers

What happens to the nucleon number during alpha decay?

It decreases by 4 (A) Signup and view all the answers

Which force becomes larger beyond a certain number of protons and neutrons in a stable nucleus?

Electromagnetic force (C) Signup and view all the answers

What type of decay usually occurs when a nucleus has too many nucleons?

Alpha decay (C) Signup and view all the answers

Why does a nucleus decay through gamma emission after another type of decay?

To release excess energy (C) Signup and view all the answers

How does the proton number change during beta decay?

It increases by 1 (D) Signup and view all the answers

What is the primary reason for more neutrons needed to keep the nucleus stable after a certain point?

To decrease the electromagnetic force (B) Signup and view all the answers