Question

The half-life of chromium-51 is 28 days. If you start with 640 g, how much will be left after 56 days?

Answer 1

The mass left after `56 " days "` is `=160g`

Explanation:

The half life of Chromium - `51` is `t_(1/2)=28d`

The original mass is `m_0 =640g`

Then , after `28` days, the mass will be `m_(28)=m_0/2=640/2=320 " g"`

and after `56` days, the mass will be `m_(56)=m_0/4=640/4=160 "g "`

Therefore,

The mass left after `56 " days "` is `=160g`