' rad ' is correct unit used to report measurement of

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13.Nuclei

easy

The '$rad$' is the correct unit used to report the measurement of

the rate of decay of a radioactive source

the ability of a beam of gamma ray photons to produce ions in a targe

the energy delivered by radiation to a target

the biological effect of radiation

(AIEEE-2006)

Solution

The risk posed to a human being by any radiation exposure depends partly upon the absorbed dose, the amount of energy absorbed per gram of tissue. Absorbed dose is expressed in rad. A rad is equal to $100$ ergs of energy absorbed by $1$ gram of tissue. The more modern, internationally adopted unit is the gray (named after the English medical physicist $L. H.$ Gray); one gray equals $100$ rad.

Standard 12

Physics

A piece of wood from a recently cut tree shows $20\,decays$ per minute. A wooden piece of same size placed in a museum ( obtained from a tree cut many years back) shows $2\,decays$ per minute. If half life of $C^{14}$ is $5730\, years$, then age of the wooden piece placed in the museum is approximately ……….. $years$

hard

(JEE MAIN-2014)

The half-life of a radioactive element $A$ is the same as the mean-life of another radioactive element $B.$ Initially both substances have the same number of atoms, then

medium

(JEE MAIN-2013)

Half-life is measured by

easy

The half life of a radioactive sample undergoing $\alpha$ – decay is $1.4 \times 10^{17}$ s. If the number of nuclei in the sample is $2.0 \times 10^{21}$, the activity of the sample is nearly

medium

(NEET-2020)

Match the nuclear processes given in column $I$ with the appropriate option$(s)$ in column $II$

column $I$ column $II$

$(A.)$Nuclear fusion $(P.)$ Absorption of thermal neutrons by ${ }_{92}^{213} U$

$(B.)$Fission in a nuclear reactor $(Q.)$ ${ }_{27}^{60} Co$ nucleus

$(C.)$ $\beta$-decay $(R.)$ Energy production in stars via hydrogen conversion to helium

$(D.)$ $\gamma$-ray emission $(S.)$ Heavy water

$(T.)$ Neutrino emission

normal

(IIT-2015)

column $I$	column $II$
$(A.)$Nuclear fusion	$(P.)$ Absorption of thermal neutrons by ${ }_{92}^{213} U$
$(B.)$Fission in a nuclear reactor	$(Q.)$ ${ }_{27}^{60} Co$ nucleus
$(C.)$ $\beta$-decay	$(R.)$ Energy production in stars via hydrogen conversion to helium
$(D.)$ $\gamma$-ray emission	$(S.)$ Heavy water
	$(T.)$ Neutrino emission

The '$rad$' is the correct unit used to report the measurement of

Solution

Similar Questions

The half-life of a radioactive element $A$ is the same as the mean-life of another radioactive element $B.$ Initially both substances have the same number of atoms, then

Half-life is measured by

The half life of a radioactive sample undergoing $\alpha$ – decay is $1.4 \times 10^{17}$ s. If the number of nuclei in the sample is $2.0 \times 10^{21}$, the activity of the sample is nearly

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