Activity of a radioactive element is $10^{3}$ dps. Its half life is $1 s e c$ . After $3 s e c$ its activity will be ( $d p s = d e c a y p e r s e c o n d$ )

1000

dps

250

dps

125

dps

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Activity of a radioactive element is 103 dps. Its half life is 1 sec. After 3 sec its activity will be (dps=decay per second)

Activity of a radioactive element is $10^{3}$ dps. Its half life is $1 s e c$ . After $3 s e c$ its activity will be ( $d p s = d e c a y p e r s e c o n d$ )