Hlepthe half-life of cobalt-60 is 5.26 years. after 10.52 years, 5 grams of a 20-gram sample will remain.

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true

false

The half-life of cobalt-60 is 5.26 years. After 10.52 years, 5 grams of a 20-gram sample will remain is TRUE

Explanation:

Mass of cobalt = 20 g  

Half-life = 5.26 years  

Mass remains after 10.52 years = 5 g  

This can be solved by using given below formula,

= initial mass  

t = number of years from when the mass was m_0  

m(t) = remaining mass after t years  

Number of half-lives =

Number of half-lives =

Number of half-lives = 2  

At time zero = 20 g  

At first half-life =  = 10 g  

At second half life = = 5 g  

The given statement is true.

yes definetly because you are using energy