Calculate the halflife for the paint 105 What is the intensi

Calculate the half-life for the paint 10.5 What is the intensity of the light at the 2nd half-life? 390.25 X lux What is the intensity of the light at the 3rd half-life? 195.125 X lux

Solution

You have correctly calculated the half life. Now first half life is at t=10.5s

Second half-life means t₂=21s

Using this time in the graph, you should get intensity at t₂=780.5lux

Third half-life means t₃=31.5s

Using this time in the graph, you should get intensity at t₃=390.25lux

For some reason you have calculated the intensity at 3rd and 4th half life time