Question

The half-life of radium is 1550 years. Calculate its disintegration constant (`lambda`) . 

Answer 1

`T_"1/2" = 1550  "years"`

⇒ `("In"  2)/lambda = 1550 xx 365 xx 24 xx 3600  "second"`

⇒ `lambda = ("In"  2)/(1550 xx 365 xx 24 xx 3600)  "s"^-1= 0.693/(1500 xx 3.1536 xx 10^7)`

⇒ `lambda = 1.418 xx 10^-11  "disintegration/second"`