You have a sample that contains the same number of atoms of the two radioactive

Question

You have a sample that contains the same number of atoms of the two radioactive isotopes of Neon; "Ne and 2"Ne. At some time in the future you find that the sample contains more Neon-24 than Neon-23. Which statement about the half lives of these isotopes is true? 68. (A) The half life of Neon-24 is shorter than the half life (B) The half life of Neon-24 is longer than the half life (C) Because these are both neon isotopes, the half lives (D) All nuclear processes have the same half life. of Neon-23 of Neon-23 are equal. What would be an acceptable measurement to make with the buret shown? 69. 30 31 (A) 30.3 mL (C) 30.33 mL (B) 31.7 mL (D) 31.67 mL

Explanation / Answer

68)

After some time, there is more Neon-24 and less Neon-23

So, less Neon-24 has decayed

that is decay constant of Neon-24 is less and hence half life is more

Answer: B

69)

Least count is 0.1 mL

So, 30.33 mL and 31.67 mL are wrong

the reading is between 30 and 31

So, it will be 30.3 mL

Answer: A

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