Which of the following statements are true ?I . All radioactive elements decay exponentially with timeII . Half-life time of radioactive element is the time required for one half of the radioactive atoms to disintegrate III . Age of the earth can be determined by radioactive dating IV . Half-life time of a radioactive element is fifty percent of its average life period.Select the correct answer using the codes given below

Which of the following statements are true ?I . All radioactive elemen

1.	Which of the following statements are true ? I . All radioactive elements decay exponentially with time II . Half-life time of radioactive element is the time required for one half of the radioactive atoms to disintegrate III . Age of the earth can be determined by radioactive dating IV . Half-life time of a radioactive element is fifty percent of its average life period. Select the correct answer using the codes given below
A.	I and II
B.	I, III and IV
C.	I, II and III
D.	II and III
Answer» D. II and III

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