What you’ll learn6 learning objectivesChoose one objective for a focused lesson, or study the complete topic.23.2.1Fluctuations in count rate provide evidence for the random nature of• understand that fluctuations in count rate provide evidence for the random nature of radioactive decaySyllabus objective23.2.2Radioactive decay is both spontaneous and random• understand that radioactive decay is both spontaneous and randomSyllabus objective23.2.3Activity and decay constant, and recall and use A = λN• define activity and decay constant, and recall and use A = λNSyllabus objective23.2.4Half-life• define half-lifeSyllabus objective23.2.5Λ = 0.693 / t 1/2• use λ = 0.693 / t 1/2Syllabus objective23.2.6The exponential nature of radioactive decay, and sketch and use the• understand the exponential nature of radioactive decay, and sketch and use the relationship x = x 0e–λt, where x could represent activity, number of undecayed nuclei or received count rateSyllabus objective