Law of Radioactive decay
« Previous Topic: Radioactivity Next Topic: Nuclear Fission, Fusion, Nuclear Energy »
NUCLEAR PHYSICS

147785 Substance $A$ has atomic mass number 16 and half life of 1 day. Another substance $B$ has atomic mass number 32 and half life of $\frac{1}{2}$ day. If both $A$ and $B$ simultaneously start undergo radio activity at the same time with initial mass $320 \mathrm{~g}$ each, how many total atoms of $A$ and $B$ combined would be left after 2 days.

1 $3.38 \times 10^{24}$
2 $6.76 \times 10^{24}$
3 $1.69 \times 10^{24}$
4 $6.76 \times 10^{23}$
JEE Main-29.01.2023
NUCLEAR PHYSICS

147787 A radioactive isotope has half-life of $T$ years. How long will it take the activity to reduce to $6.250 \%$ ?

1 $3 \mathrm{~T}$
2 $6 \mathrm{~T}$
3 $5 \mathrm{~T}$
4 $4 \mathrm{~T}$
GUJCET 18.04.2022
NUCLEAR PHYSICS

147789 A radioactive element of mass $1 \mathrm{~kg}$ after $\mathrm{N}$ years is left with only 125g. If the half life of the element is $12.5 \mathrm{yrs}$. then the value of $\mathrm{N}$ is-

1 37.5 years
2 25.0 years
3 50.0 years
4 75.0 years
AP EAMCET-07.07.2022
NUCLEAR PHYSICS

147791 The half life period of a radioactive substance is 60 days. The time taken for $\frac{7}{8}$ th of its original mass to disintegrate will be

1 120 days
2 130 days
3 180 days
4 20 days
JEE Main-28.07.2022
NUCLEAR PHYSICS

147792 What is the half-life period of a radioactive material if its activity drops to $1 / 16^{\text {th }}$ of its initial value of 30 years?

1 9.5 years
2 8.5 years
3 7.5 years
4 10.5 years
JEE Main-27.07.2022
NEET DIGITAL LIBRARY
NUCLEAR PHYSICS

147785 Substance $A$ has atomic mass number 16 and half life of 1 day. Another substance $B$ has atomic mass number 32 and half life of $\frac{1}{2}$ day. If both $A$ and $B$ simultaneously start undergo radio activity at the same time with initial mass $320 \mathrm{~g}$ each, how many total atoms of $A$ and $B$ combined would be left after 2 days.

1 $3.38 \times 10^{24}$
2 $6.76 \times 10^{24}$
3 $1.69 \times 10^{24}$
4 $6.76 \times 10^{23}$
JEE Main-29.01.2023
NUCLEAR PHYSICS

147787 A radioactive isotope has half-life of $T$ years. How long will it take the activity to reduce to $6.250 \%$ ?

1 $3 \mathrm{~T}$
2 $6 \mathrm{~T}$
3 $5 \mathrm{~T}$
4 $4 \mathrm{~T}$
GUJCET 18.04.2022
NUCLEAR PHYSICS

147789 A radioactive element of mass $1 \mathrm{~kg}$ after $\mathrm{N}$ years is left with only 125g. If the half life of the element is $12.5 \mathrm{yrs}$. then the value of $\mathrm{N}$ is-

1 37.5 years
2 25.0 years
3 50.0 years
4 75.0 years
AP EAMCET-07.07.2022
NUCLEAR PHYSICS

147791 The half life period of a radioactive substance is 60 days. The time taken for $\frac{7}{8}$ th of its original mass to disintegrate will be

1 120 days
2 130 days
3 180 days
4 20 days
JEE Main-28.07.2022
NUCLEAR PHYSICS

147792 What is the half-life period of a radioactive material if its activity drops to $1 / 16^{\text {th }}$ of its initial value of 30 years?

1 9.5 years
2 8.5 years
3 7.5 years
4 10.5 years
JEE Main-27.07.2022
Join With Us for More Updates
NUCLEAR PHYSICS

147785 Substance $A$ has atomic mass number 16 and half life of 1 day. Another substance $B$ has atomic mass number 32 and half life of $\frac{1}{2}$ day. If both $A$ and $B$ simultaneously start undergo radio activity at the same time with initial mass $320 \mathrm{~g}$ each, how many total atoms of $A$ and $B$ combined would be left after 2 days.

1 $3.38 \times 10^{24}$
2 $6.76 \times 10^{24}$
3 $1.69 \times 10^{24}$
4 $6.76 \times 10^{23}$
JEE Main-29.01.2023
NUCLEAR PHYSICS

147787 A radioactive isotope has half-life of $T$ years. How long will it take the activity to reduce to $6.250 \%$ ?

1 $3 \mathrm{~T}$
2 $6 \mathrm{~T}$
3 $5 \mathrm{~T}$
4 $4 \mathrm{~T}$
GUJCET 18.04.2022
NUCLEAR PHYSICS

147789 A radioactive element of mass $1 \mathrm{~kg}$ after $\mathrm{N}$ years is left with only 125g. If the half life of the element is $12.5 \mathrm{yrs}$. then the value of $\mathrm{N}$ is-

1 37.5 years
2 25.0 years
3 50.0 years
4 75.0 years
AP EAMCET-07.07.2022
NUCLEAR PHYSICS

147791 The half life period of a radioactive substance is 60 days. The time taken for $\frac{7}{8}$ th of its original mass to disintegrate will be

1 120 days
2 130 days
3 180 days
4 20 days
JEE Main-28.07.2022
NUCLEAR PHYSICS

147792 What is the half-life period of a radioactive material if its activity drops to $1 / 16^{\text {th }}$ of its initial value of 30 years?

1 9.5 years
2 8.5 years
3 7.5 years
4 10.5 years
JEE Main-27.07.2022
For More Updates join with Us
NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
NUCLEAR PHYSICS

147785 Substance $A$ has atomic mass number 16 and half life of 1 day. Another substance $B$ has atomic mass number 32 and half life of $\frac{1}{2}$ day. If both $A$ and $B$ simultaneously start undergo radio activity at the same time with initial mass $320 \mathrm{~g}$ each, how many total atoms of $A$ and $B$ combined would be left after 2 days.

1 $3.38 \times 10^{24}$
2 $6.76 \times 10^{24}$
3 $1.69 \times 10^{24}$
4 $6.76 \times 10^{23}$
JEE Main-29.01.2023
NUCLEAR PHYSICS

147787 A radioactive isotope has half-life of $T$ years. How long will it take the activity to reduce to $6.250 \%$ ?

1 $3 \mathrm{~T}$
2 $6 \mathrm{~T}$
3 $5 \mathrm{~T}$
4 $4 \mathrm{~T}$
GUJCET 18.04.2022
NUCLEAR PHYSICS

147789 A radioactive element of mass $1 \mathrm{~kg}$ after $\mathrm{N}$ years is left with only 125g. If the half life of the element is $12.5 \mathrm{yrs}$. then the value of $\mathrm{N}$ is-

1 37.5 years
2 25.0 years
3 50.0 years
4 75.0 years
AP EAMCET-07.07.2022
NUCLEAR PHYSICS

147791 The half life period of a radioactive substance is 60 days. The time taken for $\frac{7}{8}$ th of its original mass to disintegrate will be

1 120 days
2 130 days
3 180 days
4 20 days
JEE Main-28.07.2022
NUCLEAR PHYSICS

147792 What is the half-life period of a radioactive material if its activity drops to $1 / 16^{\text {th }}$ of its initial value of 30 years?

1 9.5 years
2 8.5 years
3 7.5 years
4 10.5 years
JEE Main-27.07.2022
NEET DIGITAL LIBRARY
NUCLEAR PHYSICS

147785 Substance $A$ has atomic mass number 16 and half life of 1 day. Another substance $B$ has atomic mass number 32 and half life of $\frac{1}{2}$ day. If both $A$ and $B$ simultaneously start undergo radio activity at the same time with initial mass $320 \mathrm{~g}$ each, how many total atoms of $A$ and $B$ combined would be left after 2 days.

1 $3.38 \times 10^{24}$
2 $6.76 \times 10^{24}$
3 $1.69 \times 10^{24}$
4 $6.76 \times 10^{23}$
JEE Main-29.01.2023
NUCLEAR PHYSICS

147787 A radioactive isotope has half-life of $T$ years. How long will it take the activity to reduce to $6.250 \%$ ?

1 $3 \mathrm{~T}$
2 $6 \mathrm{~T}$
3 $5 \mathrm{~T}$
4 $4 \mathrm{~T}$
GUJCET 18.04.2022
NUCLEAR PHYSICS

147789 A radioactive element of mass $1 \mathrm{~kg}$ after $\mathrm{N}$ years is left with only 125g. If the half life of the element is $12.5 \mathrm{yrs}$. then the value of $\mathrm{N}$ is-

1 37.5 years
2 25.0 years
3 50.0 years
4 75.0 years
AP EAMCET-07.07.2022
NUCLEAR PHYSICS

147791 The half life period of a radioactive substance is 60 days. The time taken for $\frac{7}{8}$ th of its original mass to disintegrate will be

1 120 days
2 130 days
3 180 days
4 20 days
JEE Main-28.07.2022
NUCLEAR PHYSICS

147792 What is the half-life period of a radioactive material if its activity drops to $1 / 16^{\text {th }}$ of its initial value of 30 years?

1 9.5 years
2 8.5 years
3 7.5 years
4 10.5 years
JEE Main-27.07.2022