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Radioactivity and Nuclear Transformation Quiz

15 Questions

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Radioactivity and Nuclear Transformation Quiz

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Questions and Answers

Which type of nuclear transformation involves the emission of a positron?

Alpha decay

Neutron emission

Beta decay (correct)

Proton emission

Which element has two isotopes with 75.4% abundance of one and 24.6% abundance of the other?

Chlorine (correct)

Uranium

Radium

Plutonium

What is the unit used to measure the number of atoms that decay per unit time?

MilliCurie (mCi)

Curie (Ci)

Becquerel (Bq) (correct)

MegaBecquerel (MBq)

What is the activity of one gram of pure radium?

1 Ci (A) Signup and view all the answers

What is the old unit of activity used to measure the activity of one gram of pure radium?

Curie (Ci) (B) Signup and view all the answers

Which unit is a sub-multiple of Curie commonly used to measure activity?

Kilobecquerel (kBq) (A) Signup and view all the answers

Which equation represents the radioactivity of the sample as the number of radionuclides remaining without disintegration at any time?

A(t) = λN(t) (A) Signup and view all the answers

What does the decay constant (λ) represent in the context of radioactive decay?

The rate at which unstable nuclei decay spontaneously and randomly (D) Signup and view all the answers

What does the term 'specific activity (SA)' represent in the context of radioactivity?

The activity per unit mass (D) Signup and view all the answers

What is the relationship between the half-life (t½) and the mean or average life (Ƭ)?

t½ = 0.693 / λ and Ƭ = 1/ λ (A) Signup and view all the answers

What does the half-life (t½) represent in the context of radioactive decay?

The time required to decrease the activity of any radionuclide to one-half of its initial value (B) Signup and view all the answers

What is the difference between N(t) and A(t) in the context of radioactive decay?

N(t) represents the number of radionuclides remaining without disintegration at any time, while A(t) represents the activity per unit mass (A) Signup and view all the answers

What does the mean or average life (Ƭ) represent in the context of radioactive decay?

The summation of the lifetimes of the individual atoms divided by the total number of atoms originally present (D) Signup and view all the answers

What is true about specific activity (SA)?

It is inversely proportional to t½ and directly proportional to atomic weight (A) Signup and view all the answers

"Unstable nuclei decay spontaneously and randomly". Which parameter directly represents this statement?

(λ) (B) Signup and view all the answers