Radon-222 The decay equation for radon-222 gas is known to be y = y0e-0.18t , with t in days. About how long will it take the radon in a sealed sample of air to fall to 90% of its original value?

Step 1 of 4 :

In this problem, we have to find how long will it take the radon in a sealed sample of air to fall to 90% of its original value.

Step 2 of 4 :

Given that

When t = 0

Initial

90% of initial y 90 % of