147581 In the Uranium radioactive series, the initial nucleus is ${ }_{92}^{238} \mathrm{U}$ and final nucleus is ${ }_{82}^{206} \mathrm{~Pb}$. When the Uranium nucleus decays to lead, the number of $\alpha$-particles emitted is ........ and the number of $\boldsymbol{\beta}$-particles emitted is

147583 A radioactive source has a half-life of $6 \mathrm{~h}$. A freshly prepared sample of the same exhibits radioactivity 32 times the permissible safe value. The minimum time after which it would be possible to work safely with the source is

147584 The half-life of a radioactive isotope is $30 \mathrm{~h}$. How long will it take to get reduced to $12.5 \%$ of its initial amount?

147585 Half-life of radioactive sample is $24 \mathrm{~h}$. If a newly prepared radioactive sample shows 4 times the allowed and safe value of radio activity, the minimum time after which one can work safety with the source is

147586 The half-life of a radioactive sample is $5 \mathrm{~s}$. If the initial mass of the sample is $60 \mathrm{~g}$, then the time required to reduce the sample to $7.5 \mathrm{~g}$ is

147581 In the Uranium radioactive series, the initial nucleus is ${ }_{92}^{238} \mathrm{U}$ and final nucleus is ${ }_{82}^{206} \mathrm{~Pb}$. When the Uranium nucleus decays to lead, the number of $\alpha$-particles emitted is ........ and the number of $\boldsymbol{\beta}$-particles emitted is

147583 A radioactive source has a half-life of $6 \mathrm{~h}$. A freshly prepared sample of the same exhibits radioactivity 32 times the permissible safe value. The minimum time after which it would be possible to work safely with the source is

147584 The half-life of a radioactive isotope is $30 \mathrm{~h}$. How long will it take to get reduced to $12.5 \%$ of its initial amount?

147585 Half-life of radioactive sample is $24 \mathrm{~h}$. If a newly prepared radioactive sample shows 4 times the allowed and safe value of radio activity, the minimum time after which one can work safety with the source is

147586 The half-life of a radioactive sample is $5 \mathrm{~s}$. If the initial mass of the sample is $60 \mathrm{~g}$, then the time required to reduce the sample to $7.5 \mathrm{~g}$ is

147581 In the Uranium radioactive series, the initial nucleus is ${ }_{92}^{238} \mathrm{U}$ and final nucleus is ${ }_{82}^{206} \mathrm{~Pb}$. When the Uranium nucleus decays to lead, the number of $\alpha$-particles emitted is ........ and the number of $\boldsymbol{\beta}$-particles emitted is

147583 A radioactive source has a half-life of $6 \mathrm{~h}$. A freshly prepared sample of the same exhibits radioactivity 32 times the permissible safe value. The minimum time after which it would be possible to work safely with the source is

147584 The half-life of a radioactive isotope is $30 \mathrm{~h}$. How long will it take to get reduced to $12.5 \%$ of its initial amount?

147585 Half-life of radioactive sample is $24 \mathrm{~h}$. If a newly prepared radioactive sample shows 4 times the allowed and safe value of radio activity, the minimum time after which one can work safety with the source is

147586 The half-life of a radioactive sample is $5 \mathrm{~s}$. If the initial mass of the sample is $60 \mathrm{~g}$, then the time required to reduce the sample to $7.5 \mathrm{~g}$ is

147581 In the Uranium radioactive series, the initial nucleus is ${ }_{92}^{238} \mathrm{U}$ and final nucleus is ${ }_{82}^{206} \mathrm{~Pb}$. When the Uranium nucleus decays to lead, the number of $\alpha$-particles emitted is ........ and the number of $\boldsymbol{\beta}$-particles emitted is

147583 A radioactive source has a half-life of $6 \mathrm{~h}$. A freshly prepared sample of the same exhibits radioactivity 32 times the permissible safe value. The minimum time after which it would be possible to work safely with the source is

147584 The half-life of a radioactive isotope is $30 \mathrm{~h}$. How long will it take to get reduced to $12.5 \%$ of its initial amount?

147585 Half-life of radioactive sample is $24 \mathrm{~h}$. If a newly prepared radioactive sample shows 4 times the allowed and safe value of radio activity, the minimum time after which one can work safety with the source is

147586 The half-life of a radioactive sample is $5 \mathrm{~s}$. If the initial mass of the sample is $60 \mathrm{~g}$, then the time required to reduce the sample to $7.5 \mathrm{~g}$ is

147581 In the Uranium radioactive series, the initial nucleus is ${ }_{92}^{238} \mathrm{U}$ and final nucleus is ${ }_{82}^{206} \mathrm{~Pb}$. When the Uranium nucleus decays to lead, the number of $\alpha$-particles emitted is ........ and the number of $\boldsymbol{\beta}$-particles emitted is

147583 A radioactive source has a half-life of $6 \mathrm{~h}$. A freshly prepared sample of the same exhibits radioactivity 32 times the permissible safe value. The minimum time after which it would be possible to work safely with the source is

147584 The half-life of a radioactive isotope is $30 \mathrm{~h}$. How long will it take to get reduced to $12.5 \%$ of its initial amount?

147585 Half-life of radioactive sample is $24 \mathrm{~h}$. If a newly prepared radioactive sample shows 4 times the allowed and safe value of radio activity, the minimum time after which one can work safety with the source is

147586 The half-life of a radioactive sample is $5 \mathrm{~s}$. If the initial mass of the sample is $60 \mathrm{~g}$, then the time required to reduce the sample to $7.5 \mathrm{~g}$ is