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16 grams of radioactive material decays into 8 grams in 10
years. How long will it take to decay to 1 gram?
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Answer / pushpendra ahirwar
It's correct answer is 40 years.
16 gm to 8 gm in 10 years
8 gm to 4 gm in 10 years {again}
4 gm to 2 gm in 10 years
2 gm to 1 gm in 10 years
So, It will take {10+10+10+10=40} 40 years.
| Is This Answer Correct ? | 53 Yes | 16 No |
Answer / valarmathy
16 gm reduced to 8gm in 10yrs
so 8 gm get decayed
for decaying 1 gm it takes 10/8 yrs
for decaying 8 gm it takes 10/8*8
remaining 8 gm
need to decay 7 to get 1 gm remaining
for decaying 7 it takes
10/8*8*7
=10*7
=70 years
| Is This Answer Correct ? | 21 Yes | 4 No |
Answer / mayank chopra
It's correct answer is 40 years.
16 gm to 8 gm in 10 years
8 gm to 4 gm in 10 years {again}
4 gm to 2 gm in 10 years
2 gm to 1 gm in 10 years
So, It will take {10+10+10+10=40} 40 years.
| Is This Answer Correct ? | 12 Yes | 8 No |
Answer / kishan trambadiya
16 gms to 8 gms in 10 years
8 gms to 4 gms in 10 years {again}
4 gms to 2 gms in 10 years
2 gms to 1 gm in 10 years
So, It will take {10+10+10+10=40} 40 years
| Is This Answer Correct ? | 6 Yes | 4 No |
Answer / engr shahid
it will take 18 years 2 month and 15 days
16 gm to 8 gm in 10 years
8 gm to 4 gm in 5 years {again}
4 gm to 2 gm in 2.5 years
2 gm to 1 gm in 1.25 years
So, It will take (10+5+2.5+1.25)years.
| Is This Answer Correct ? | 3 Yes | 11 No |
Answer / sridhar
another 8yrs sufficient to decay it to almost 1 gm
| Is This Answer Correct ? | 1 Yes | 9 No |
Answer / gomathi
As 16 gram takes 10 years to decay into 8 grams it will
take another ten years to become 0 grams so to become one
gram it may 19 years..
| Is This Answer Correct ? | 2 Yes | 12 No |
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