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Half-life.docx - Name: _ Date: _ Student Exploration:...

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Name: ______________________________________Date: ________________________Student Exploration: Half-lifeGizmo Warm-upLike an unpopped kernel in the microwave, aradioactiveatom can change at any time. Radioactive atoms changeby emittingradiationin the form of tiny particles and/orenergy. This process, calleddecay, causes theradioactive atom to change into a stabledaughter atom.TheHalf-lifeGizmo allows you to observe and measurethe decay of a radioactive substance. Be sure the soundis turned on and clickPlay().1.What do you see and hear? ___________________________________________________________________________________________________________________________Note: The clicking sound you hear comes from aGeiger counter, an instrument that detectsthe particles and energy emitted by decaying radioactive atoms.2.What remains at the end of the decay process?___________________________________3.Is the rate of decay fastest at the beginning, middle, or end of the process?_____________Decay curvesGet the Gizmo ready:ClickReset(). Be sure thatUser chooses half-lifeandRandom decayare selected.Check that theHalf-lifeis 20 seconds and theNumber of atomsis 128.Question: How do we measure the rate of radioactive decay?4.Observe: Select the BAR CHART on the right side of the Gizmo and clickPlayi.What happens to the numbers of radioactive and daughter atoms as thesimulation proceeds?.

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