For an unknown element X the wavelength recorded is 2.9x10A-2 m, the half life of element is _ years
Correct answer: D. None of thses
- A. 50
- B. 100
- C. 1000
- D. None of thses
Explanation
None of the given answer is correct so option D is appropriate.As this is a numerical thus only one option is correct.
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