Half-Life and Radioactive Decay Kinetics

Chemistry ⇒ Chemical Kinetics and Equilibrium

Half-Life and Radioactive Decay Kinetics starts at 11 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Half-Life and Radioactive Decay Kinetics. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 12

Define half-life in the context of radioactive decay.

Describe how the concept of half-life is used in radiometric dating.

Describe the difference between half-life and mean life of a radioactive substance.

Explain why radioactive decay is considered a random process.

Which of the following best describes the change in activity of a radioactive sample over time? (1) Increases, (2) Remains constant, (3) Decreases exponentially, (4) Decreases linearly

Which of the following best describes the decay of a radioactive substance? (1) Linear, (2) Exponential, (3) Logarithmic, (4) Quadratic

Which of the following best represents the fraction of a radioactive sample remaining after n half-lives? (1) 1/n, (2) 1/2ⁿ, (3) n/2, (4) 2n

Which of the following equations correctly relates half-life (t_1/2) and the decay constant (k) for a first-order reaction? (1) t_1/2 = 0.693/k, (2) t_1/2 = k/0.693, (3) t_1/2 = k × 0.693, (4) t_1/2 = 2k

Fill in the blank: After three half-lives, the fraction of the original radioactive nuclei remaining is _______.

Fill in the blank: The decay constant (k) is related to the half-life by the equation k = _______.

Fill in the blank: The half-life of a radioactive isotope is the time taken for its activity to fall to _______ of its initial value.

Fill in the blank: The mathematical expression for the number of undecayed nuclei at time t is N = N₀e^-kt, where N₀ is the _______ number of nuclei.

Is the following statement true or false? 'After two half-lives, one quarter of the original radioactive nuclei remain.'

Is the following statement true or false? 'The decay constant and half-life are inversely proportional.'

Is the following statement true or false? 'The rate of radioactive decay increases as the number of undecayed nuclei decreases.'

True or False: The decay of radioactive nuclei is a first-order kinetic process.