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Half-life of a redioactive substance which disintegrates by 75% in 60 minutes will be
- a)20 min
- b)30 min
- c)45 min
- d)120 min
Correct answer is option 'B'. Can you explain this answer?
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Half-life Calculation:
- The half-life of a radioactive substance is the time it takes for half of the substance to decay.
- Given that the substance disintegrates by 75% in 60 minutes, it means that only 25% of the substance remains after 60 minutes.
Calculation:
- Let's assume the initial amount of the substance is 100 units.
- After 60 minutes, only 25 units of the substance remain (25% of 100).
- This implies that 75 units (75%) have decayed in 60 minutes.
Half-life Calculation:
- Since 75 units have decayed in 60 minutes, it means that 50 units (half of 100) would decay in the first half-life period.
- Therefore, the half-life of the substance is 60 minutes.
Therefore, the correct answer is option B) 30 min.
- The half-life of a radioactive substance is the time it takes for half of the substance to decay.
- Given that the substance disintegrates by 75% in 60 minutes, it means that only 25% of the substance remains after 60 minutes.
Calculation:
- Let's assume the initial amount of the substance is 100 units.
- After 60 minutes, only 25 units of the substance remain (25% of 100).
- This implies that 75 units (75%) have decayed in 60 minutes.
Half-life Calculation:
- Since 75 units have decayed in 60 minutes, it means that 50 units (half of 100) would decay in the first half-life period.
- Therefore, the half-life of the substance is 60 minutes.
Therefore, the correct answer is option B) 30 min.
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Half-life of a redioactive substance which disintegrates by 75% in 60 minutes will bea)20 minb)30 minc)45 mind)120 minCorrect answer is option 'B'. Can you explain this answer?
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