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22 Aug 2026, 01:36
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Difficulty:
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54% (01:03) correct
46%
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A radioactive sample halves every 5 hours. A lab needs the sample to fall below 1/32 of its original mass. If they instead begin with a sample already at 1/4 of the standard starting mass, how many hours until it falls below 1/32 of the standard starting mass?
A) 10
B) 15
C) 20
D) 25
E) 30
A) 10
B) 15
C) 20
D) 25
E) 30
23 Aug 2026, 22:15
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Hi,
Somehow, I am still getting 15 hours no matter how I approach this question.
1/4 starting,
1/8 in 5 hours,
1/16 in 10 hours,
1/32 in 15 hours.
Can someone please help me understand the pitfall in my understanding?
Somehow, I am still getting 15 hours no matter how I approach this question.
1/4 starting,
1/8 in 5 hours,
1/16 in 10 hours,
1/32 in 15 hours.
Can someone please help me understand the pitfall in my understanding?
