Q. |
Which of the following statements are true?
1. All radioactive element decay exponentially with time.
2. Half life time of radioactive element in the time required for one half of the radioactive atoms to disintegrate.
3. Age of the earth can be determined by Radioactive dating.
4. Half life time of radioactive element is 50 percent of its average life period.
Select the correct answer using the codes given below |
| (a)1 and 2 | | (b)1, 3 and 4 | (c)1, 2 and 3  | | (d)2 and 3 |
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