Radioactive Decay
Chemistry ⇒ Nuclear Chemistry
Radioactive Decay starts at 10 and continues till grade 12.
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Describe the change in atomic number and mass number during beta-minus decay.
Describe the main difference between alpha and beta decay.
Describe the process of positron emission in radioactive decay.
Explain the term 'parent' and 'daughter' nuclide in radioactive decay.
A 100 g sample of a radioactive isotope decays to 25 g in 6 hours. What is its half-life?
A radioactive isotope decays with a half-life of 10 days. If you start with 200 mg, how much will remain after 30 days?
A radioactive isotope has a half-life of 4 days. If you start with 32 g, how much will remain after 12 days?
A radioactive sample has a decay constant of 0.231 day-1. Calculate its half-life in days.
If a radioactive isotope has a half-life of 5 years, what fraction of the original sample remains after 15 years? (1) 1/2 (2) 1/4 (3) 1/8 (4) 1/16
Which of the following best describes gamma decay? (1) Emission of a helium nucleus (2) Emission of an electron (3) Emission of electromagnetic radiation (4) Emission of a positron
Which of the following is a correct nuclear equation for beta-minus decay? (1) 14C → 14N + e- + νe (2) 14C → 14B + e- + νe (3) 14C → 13B + e- + νe (4) 14C → 13N + e- + νe
Which of the following is a property of alpha particles? (1) High penetration (2) Positive charge (3) No mass (4) Negative charge
The decay constant (λ) is related to the half-life (t1/2) by the equation t1/2 = _______ / λ.
The half-life of a radioactive isotope is the time required for _______ of the original nuclei to decay.
The number of disintegrations per second in a radioactive sample is called its _______.
The process by which a radioactive nucleus emits radiation to become more stable is called _______.
True or False: All isotopes of an element are radioactive.
True or False: Beta-plus decay results in the emission of a positron.
True or False: In alpha decay, the mass number of the nucleus decreases by 4 and the atomic number decreases by 2.
True or False: The activity of a radioactive sample is directly proportional to the number of undecayed nuclei present.
