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A radioactive isotope X has a half life ...

A radioactive isotope X has a half life of 3 seconds. At t=0, a given sample of this isotope contains 8000 atom. Calculate (i) its decay constant (ii) average life (iii) the time `t_1`, when 1000 atoms of the isotope X remain in the sample (iv) number of decay/sec in the sample at `t=t_1sec.`

A

2s

B

4s

C

7s

D

9s

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The correct Answer is:
D
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NCERT FINGERTIPS-PRACTICE PAPPER-Practice Paper 3
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