Radioactivity
« Previous Topic: Nuclear Force Next Topic: Law of Radioactive decay »
NUCLEAR PHYSICS

147692 The mean lives of a radioactive substance are $1620 \mathrm{yr}$ and $405 \mathrm{yr}$ for $\alpha$-emission and $\beta$ emission, respectively. Find out the time during which three-fourth of a sample will decay, if it is decaying both by $\alpha$-emission and $\beta$-emission simultaneously.

1 $643 \mathrm{yr}$
2 $449 \mathrm{yr}$
3 $528 \mathrm{yr}$
4 $279 \mathrm{yr}$
JCECE-2016
NUCLEAR PHYSICS

147693 ${ }_{87}^{221} \mathrm{Ra}$ undergoes radioactive decay with a halflife of 4 days, the probability that a Ra nucleus will disintegrate in 8 days is

1 $\frac{1}{2}$
2 $\frac{3}{8}$
3 $\frac{1}{4}$
4 $\frac{3}{4}$
JCECE-2015
NUCLEAR PHYSICS

147694 The half-life period of a radioactive substance is 140 days. After, how much time, 15g will decay from a $16 \mathrm{~g}$ sample of the substance?

1 140 days
2 280 days
3 420 days
4 560 days
JCECE-2014
NUCLEAR PHYSICS

147695 Let $\mathbf{T}$ be the mean life of a radioactive sample $75 \%$ of the active nuclei present in the sample initially will decay in time

1 $2 \mathrm{~T}$
2 $\frac{1}{2}(\ln 2) \mathrm{T}$
3 $4 \mathrm{~T}$
4 $2(\ln 2) \mathrm{T}$
JCECE-2011
NUCLEAR PHYSICS

147696 A radioactive material decays by simultaneous emission of two particles with half-lives $1620 \mathrm{yr}$ and $810 \mathrm{yr}$ respectively. The time in year after which one-fourth of the material remains, is

1 $4860 \mathrm{yr}$
2 $3240 \mathrm{yr}$
3 $2340 \mathrm{yr}$
4 $1080 \mathrm{yr}$
JCECE-2010
NEET DIGITAL LIBRARY
NUCLEAR PHYSICS

147692 The mean lives of a radioactive substance are $1620 \mathrm{yr}$ and $405 \mathrm{yr}$ for $\alpha$-emission and $\beta$ emission, respectively. Find out the time during which three-fourth of a sample will decay, if it is decaying both by $\alpha$-emission and $\beta$-emission simultaneously.

1 $643 \mathrm{yr}$
2 $449 \mathrm{yr}$
3 $528 \mathrm{yr}$
4 $279 \mathrm{yr}$
JCECE-2016
NUCLEAR PHYSICS

147693 ${ }_{87}^{221} \mathrm{Ra}$ undergoes radioactive decay with a halflife of 4 days, the probability that a Ra nucleus will disintegrate in 8 days is

1 $\frac{1}{2}$
2 $\frac{3}{8}$
3 $\frac{1}{4}$
4 $\frac{3}{4}$
JCECE-2015
NUCLEAR PHYSICS

147694 The half-life period of a radioactive substance is 140 days. After, how much time, 15g will decay from a $16 \mathrm{~g}$ sample of the substance?

1 140 days
2 280 days
3 420 days
4 560 days
JCECE-2014
NUCLEAR PHYSICS

147695 Let $\mathbf{T}$ be the mean life of a radioactive sample $75 \%$ of the active nuclei present in the sample initially will decay in time

1 $2 \mathrm{~T}$
2 $\frac{1}{2}(\ln 2) \mathrm{T}$
3 $4 \mathrm{~T}$
4 $2(\ln 2) \mathrm{T}$
JCECE-2011
NUCLEAR PHYSICS

147696 A radioactive material decays by simultaneous emission of two particles with half-lives $1620 \mathrm{yr}$ and $810 \mathrm{yr}$ respectively. The time in year after which one-fourth of the material remains, is

1 $4860 \mathrm{yr}$
2 $3240 \mathrm{yr}$
3 $2340 \mathrm{yr}$
4 $1080 \mathrm{yr}$
JCECE-2010
Join With Us for More Updates
NUCLEAR PHYSICS

147692 The mean lives of a radioactive substance are $1620 \mathrm{yr}$ and $405 \mathrm{yr}$ for $\alpha$-emission and $\beta$ emission, respectively. Find out the time during which three-fourth of a sample will decay, if it is decaying both by $\alpha$-emission and $\beta$-emission simultaneously.

1 $643 \mathrm{yr}$
2 $449 \mathrm{yr}$
3 $528 \mathrm{yr}$
4 $279 \mathrm{yr}$
JCECE-2016
NUCLEAR PHYSICS

147693 ${ }_{87}^{221} \mathrm{Ra}$ undergoes radioactive decay with a halflife of 4 days, the probability that a Ra nucleus will disintegrate in 8 days is

1 $\frac{1}{2}$
2 $\frac{3}{8}$
3 $\frac{1}{4}$
4 $\frac{3}{4}$
JCECE-2015
NUCLEAR PHYSICS

147694 The half-life period of a radioactive substance is 140 days. After, how much time, 15g will decay from a $16 \mathrm{~g}$ sample of the substance?

1 140 days
2 280 days
3 420 days
4 560 days
JCECE-2014
NUCLEAR PHYSICS

147695 Let $\mathbf{T}$ be the mean life of a radioactive sample $75 \%$ of the active nuclei present in the sample initially will decay in time

1 $2 \mathrm{~T}$
2 $\frac{1}{2}(\ln 2) \mathrm{T}$
3 $4 \mathrm{~T}$
4 $2(\ln 2) \mathrm{T}$
JCECE-2011
NUCLEAR PHYSICS

147696 A radioactive material decays by simultaneous emission of two particles with half-lives $1620 \mathrm{yr}$ and $810 \mathrm{yr}$ respectively. The time in year after which one-fourth of the material remains, is

1 $4860 \mathrm{yr}$
2 $3240 \mathrm{yr}$
3 $2340 \mathrm{yr}$
4 $1080 \mathrm{yr}$
JCECE-2010
For More Updates join with Us
NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
NUCLEAR PHYSICS

147692 The mean lives of a radioactive substance are $1620 \mathrm{yr}$ and $405 \mathrm{yr}$ for $\alpha$-emission and $\beta$ emission, respectively. Find out the time during which three-fourth of a sample will decay, if it is decaying both by $\alpha$-emission and $\beta$-emission simultaneously.

1 $643 \mathrm{yr}$
2 $449 \mathrm{yr}$
3 $528 \mathrm{yr}$
4 $279 \mathrm{yr}$
JCECE-2016
NUCLEAR PHYSICS

147693 ${ }_{87}^{221} \mathrm{Ra}$ undergoes radioactive decay with a halflife of 4 days, the probability that a Ra nucleus will disintegrate in 8 days is

1 $\frac{1}{2}$
2 $\frac{3}{8}$
3 $\frac{1}{4}$
4 $\frac{3}{4}$
JCECE-2015
NUCLEAR PHYSICS

147694 The half-life period of a radioactive substance is 140 days. After, how much time, 15g will decay from a $16 \mathrm{~g}$ sample of the substance?

1 140 days
2 280 days
3 420 days
4 560 days
JCECE-2014
NUCLEAR PHYSICS

147695 Let $\mathbf{T}$ be the mean life of a radioactive sample $75 \%$ of the active nuclei present in the sample initially will decay in time

1 $2 \mathrm{~T}$
2 $\frac{1}{2}(\ln 2) \mathrm{T}$
3 $4 \mathrm{~T}$
4 $2(\ln 2) \mathrm{T}$
JCECE-2011
NUCLEAR PHYSICS

147696 A radioactive material decays by simultaneous emission of two particles with half-lives $1620 \mathrm{yr}$ and $810 \mathrm{yr}$ respectively. The time in year after which one-fourth of the material remains, is

1 $4860 \mathrm{yr}$
2 $3240 \mathrm{yr}$
3 $2340 \mathrm{yr}$
4 $1080 \mathrm{yr}$
JCECE-2010
NEET DIGITAL LIBRARY
NUCLEAR PHYSICS

147692 The mean lives of a radioactive substance are $1620 \mathrm{yr}$ and $405 \mathrm{yr}$ for $\alpha$-emission and $\beta$ emission, respectively. Find out the time during which three-fourth of a sample will decay, if it is decaying both by $\alpha$-emission and $\beta$-emission simultaneously.

1 $643 \mathrm{yr}$
2 $449 \mathrm{yr}$
3 $528 \mathrm{yr}$
4 $279 \mathrm{yr}$
JCECE-2016
NUCLEAR PHYSICS

147693 ${ }_{87}^{221} \mathrm{Ra}$ undergoes radioactive decay with a halflife of 4 days, the probability that a Ra nucleus will disintegrate in 8 days is

1 $\frac{1}{2}$
2 $\frac{3}{8}$
3 $\frac{1}{4}$
4 $\frac{3}{4}$
JCECE-2015
NUCLEAR PHYSICS

147694 The half-life period of a radioactive substance is 140 days. After, how much time, 15g will decay from a $16 \mathrm{~g}$ sample of the substance?

1 140 days
2 280 days
3 420 days
4 560 days
JCECE-2014
NUCLEAR PHYSICS

147695 Let $\mathbf{T}$ be the mean life of a radioactive sample $75 \%$ of the active nuclei present in the sample initially will decay in time

1 $2 \mathrm{~T}$
2 $\frac{1}{2}(\ln 2) \mathrm{T}$
3 $4 \mathrm{~T}$
4 $2(\ln 2) \mathrm{T}$
JCECE-2011
NUCLEAR PHYSICS

147696 A radioactive material decays by simultaneous emission of two particles with half-lives $1620 \mathrm{yr}$ and $810 \mathrm{yr}$ respectively. The time in year after which one-fourth of the material remains, is

1 $4860 \mathrm{yr}$
2 $3240 \mathrm{yr}$
3 $2340 \mathrm{yr}$
4 $1080 \mathrm{yr}$
JCECE-2010