Carbon dating is best suited for determining age of fossils if their age in years is of order of

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13.Nuclei

easy

Carbon dating is best suited for determining the age of fossils if their age in years is of the order of

${10^3}$

${10^4}$

${10^5}$

${10^6}$

(AIIMS-2004)

Solution

(b) Carbon dating has been used to determine the age of upto $45000$ yr (i e, of the order of $10^{4}$ yr ) old rocks and fossils. For dating still older, Potassium-Argon method is widely used because radioactive potassium is found almost in all rocks and fuels and their rate of losing radioactivity is very slow.

Standard 12

Physics

A sample contains $10^{-2}\, kg$ each of two substances A and $B$ with half lives $4 \,s$ and $8 \,s$ respectively. The ratio of then atomic weights is $1: 2$ The ratio of the amounts of $A$ and $B$ after $16 \,s$ is $\frac{x}{100}$. the value of $x$ is……..

medium

(JEE MAIN-2022)

The decay constant of a radio isotope is $\lambda$. If $A_1$ and $A_2$ are its activities at times $t_1$ and $t_2$ respectively, the number of nuclei which have decayed during the time $(t_1 – t_2)$

easy

(AIPMT-2010)

The half-life of a radioactive nuclide is $100 \,hours.$ The fraction of original activity that will remain after $150\, hours$ would be :

medium

(NEET-2021)

Half life of radium is $1620$ years. How many radium nuclei decay in $5$ hours in $5\, gm$ radium? ( Atomic weight of radium $= 223$)

hard

A freshly prepared radioactive source of half life $2$ hours $30$ minutes emits radiation which is $64$ times the permissible safe level. The minimum time, after which it would be possible to work safely with source, will be hours.

medium

(JEE MAIN-2022)

Carbon dating is best suited for determining the age of fossils if their age in years is of the order of

Solution

Similar Questions

A sample contains $10^{-2}\, kg$ each of two substances A and $B$ with half lives $4 \,s$ and $8 \,s$ respectively. The ratio of then atomic weights is $1: 2$ The ratio of the amounts of $A$ and $B$ after $16 \,s$ is $\frac{x}{100}$. the value of $x$ is……..

The decay constant of a radio isotope is $\lambda$. If $A_1$ and $A_2$ are its activities at times $t_1$ and $t_2$ respectively, the number of nuclei which have decayed during the time $(t_1 – t_2)$

The half-life of a radioactive nuclide is $100 \,hours.$ The fraction of original activity that will remain after $150\, hours$ would be :

Half life of radium is $1620$ years. How many radium nuclei decay in $5$ hours in $5\, gm$ radium? ( Atomic weight of radium $= 223$)

A freshly prepared radioactive source of half life $2$ hours $30$ minutes emits radiation which is $64$ times the permissible safe level. The minimum time, after which it would be possible to work safely with source, will be hours.

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