Question

At time t = 0, some radioactive gas is injected into a sealed vessel. At time T, some more of the same gas is injected into the same vessel. Which one of the following graphs best represents the variation of the logarithm of the activity A of the gas with time t?

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

$A=A_0{e}^{-{\lambda }_t}\ell nA=\ell n{A}_0+\ell n{e}^{-{\lambda }_t}\ell nA=\ell n{A}_0-\lambda t$