Half Life Physics 2 Additional Science Chapter 13.

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Presentation transcript:

Half Life Physics 2 Additional Science Chapter 13

The time radioactivity takes to reach half its dose What is “Half Life”? The time taken for half the radioactive atoms to decay OR Additional Science Chapter 13

Number of popcorn left Time (seonds) Half-life of the popcorn = 10s Example of half-life, using a pan of popping popcorn Additional Science Chapter 13

20s40s 30s 10s 50s 0sExercise Number of popcorn left Time (seconds) Half life of the popcorn = 20s The half life of the popcorn is 20s The sample contains 32 popcorn at the start. How many will be left after 60s? ? Answer = 4 Additional Science Chapter 13

Number of nuclei remaining Time (years) 1. How many will be left after 1300 years? 2. How many years will have passed before it is harmless? Nuclei Years Question on half life Answer1 Answer 2 Explanation Half Life nuclei 2.6 x 433 years = 2598 years The half life of americium is 433 years. The example contains 480 nuclei. Additional Science Chapter 13

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