Radium has a half-life of 5 yr. The probability of decay of a radium nucleus in 10 yr is

Options

A. A)0.5
B. B)0.75
C. C)1
D. D)0.6

Answer

B

Explanation

`(N)/(N_(0))=((1)/(2))^(t//T)=((1)/(2))^(10/5)`
`=((1)/(2))^(2)=(1)/(4)=25%`
This is probability of remaining portion of radium.
So, probability of decay
`=(100-25)%`
`=75%`