1. Half Life

2. The half-life of a quantity whose value decreases with time is the interval required for the quantity to decay to half of its initial value.

6. Half life Experiment Take 100 pennies and put them in a box Shake the box Take out all the pennies that are heads up Count them / graph it Shake the box Take out all the pennies that are heads up Count them / graph it continue until you run out of pennies

7. Half Life Experiment 2 T=0 100 pennies T=1 (1 st shake) T=2 (2 nd shake) T=3 (3 rd shake) T=4 (4 th shake) T=5 (5 th shake) T=6 (6 th shake) T=7 (7 th shake) T=8 (8 th shake) T=9 (9 th shake) T=10 (10 th shake) T=11 (11 th shake)

8. Graph of half life 0 1 2 3 4 5 6 7 8 9 10 11 12 Time in trials 100 90 80 70 60 50 40 30 20 10 0 PennIesPennIes