Radium - $221$ has a half-life of $30 \mathrm {~s}$ . Suppose we have a $300 \mathrm {~g}$ sample.
(a) Find a formula for the mass remaining after $t$seconds
b) How much of the sample remains after $200$seconds?
c) After how long will only $20 \mathrm {~g}$ remain?

Question

Radium - $221$ has a half-life of $30 \mathrm {~s}$ . Suppose we have a $300 \mathrm {~g}$ sample. 
(a) Find a formula for the mass remaining after $t$seconds
b) How much of the sample remains after $200$seconds?
c) After how long will only $20 \mathrm {~g}$ remain?

Quizplus · Accepted Answer

The Answer of Radium - $221$ has a half-life of $30 \mathrm {~s}$ . Suppose we have a $300 \mathrm {~g}$ sample. 
(a) Find a formula for the mass remaining after $t$seconds
b) How much of the sample remains after $200$seconds?
c) After how long will only $20 \mathrm {~g}$ remain?

Radium - 221221221 Has a Half-Life Of 30 s30 \mathrm {~s}30 s Suppose We Have A Half-Life

Radium - $221$ Has a Half-Life Of $30 \mathrm {~s}$ Suppose We Have A Half-Life