1.

Half-life of radius is 1580 yr. Its average life will be

Answer»

`2.5 xx 10^(3) YR`
`1.832 xx 10^(3) yr`
`2.275 xx 10^(3) yr`
`8.825xx 10^(2) yr`

Solution :Average life PERIOD `= 1.44 xx t_(1//2)`
`1.44 xx 1580 = 2275.2 = 2.275 xx 10^(3) yr`


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