MPSC Rajyaseva 2020 GS Paper 1 — Question 55

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ट्रिटियमचे अर्धआयुष्य 12.5 वर्षे असून त्याचा बीटा किरणांनी क्षय होतोय. 25 वर्षानंतर मूळ ट्रिटियमचा किती अंश अक्षय शिल्लक राहील ? / Tritium has a half-life of 12.5 years, undergoing beta decay. What fraction of original Tritium will remain undecayed after 25 years ?

1)0 (शून्य) / 0 (zero)

2)0.5 / 0.5

3)0.25 / 0.25✓ Correct

4)0.125 / 0.125

The half-life of tritium is 12.5 years. After 25 years, which is 2 half-lives (25 / 12.5 = 2), the remaining undecayed fraction is (1/2)² = 1/4 of the original amount.

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