(A) Cobalt-$60$ $(^{60}Co)$ is a radioactive isotope of cobalt.It undergoes radioactive decay and emits high-energy $\gamma$-radiations.These $\gamma$

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(A) Cobalt-$60$ $(^{60}Co)$ is a radioactive isotope of cobalt.It undergoes radioactive decay and emits high-energy $\gamma$-radiations.These $\gamma$-radiations have high penetrating power and are used in radiation therapy to target and destroy cancerous cells.Therefore,the Assertion is correct,the Reason is correct,and the Reason provides the correct explanation for the Assertion.

Class 12 Physics Nuclei Properties of Alpha, Beta and Gamma Rays and Decay Process

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Assertion: Cobalt-$60$ is useful in cancer therapy.
Reason: Cobalt-$60$ is a source of $\gamma$-radiations capable of killing cancerous cells.

AIIMS 2006 All AIIMS

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.

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Nuclei

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Properties of Alpha, Beta and Gamma Rays and Decay Process

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The most penetrating radiation out of the following is

EasyAIPMT 1997

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Arrange the radioactive radiations in increasing order of their ionizing power and penetrating power.

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Outside a nucleus,which of the following statements is true?

Easy

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The total number of $\alpha$ and $\beta$ particles emitted in the nuclear reaction ${ }_{92}^{238} U \rightarrow{ }_{82}^{214} Pb$ is

DifficultIIT 2009

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$A$ radioactive nucleus decays as follows:
$X \xrightarrow{\alpha} X_1 \xrightarrow{\beta} X_2 \xrightarrow{\alpha} X_3 \xrightarrow{\gamma} X_4$
If the atomic number and the mass number of $X$ are $72$ and $180$ respectively,then the mass number and atomic number of $X_4$ are:

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Assertion: Cobalt-$60$ is useful in cancer therapy.Reason: Cobalt-$60$ is a source of $\gamma$-radiations capable of killing cancerous cells.

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The most penetrating radiation out of the following is

Arrange the radioactive radiations in increasing order of their ionizing power and penetrating power.

Outside a nucleus,which of the following statements is true?

The total number of $\alpha$ and $\beta$ particles emitted in the nuclear reaction ${ }_{92}^{238} U \rightarrow{ }_{82}^{214} Pb$ is

$A$ radioactive nucleus decays as follows:$X \xrightarrow{\alpha} X_1 \xrightarrow{\beta} X_2 \xrightarrow{\alpha} X_3 \xrightarrow{\gamma} X_4$If the atomic number and the mass number of $X$ are $72$ and $180$ respectively,then the mass number and atomic number of $X_4$ are:

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Assertion: Cobalt-$60$ is useful in cancer therapy.
Reason: Cobalt-$60$ is a source of $\gamma$-radiations capable of killing cancerous cells.

$A$ radioactive nucleus decays as follows:
$X \xrightarrow{\alpha} X_1 \xrightarrow{\beta} X_2 \xrightarrow{\alpha} X_3 \xrightarrow{\gamma} X_4$
If the atomic number and the mass number of $X$ are $72$ and $180$ respectively,then the mass number and atomic number of $X_4$ are: