Question

One curie is equal to ( in disintegration/s )
$A.3.7\times {{10}^{10}}$
$B.3.2\times {{10}^{8}}$
$C.2.8\times {{10}^{10}}$
$D.$none of these

Answer 1

We know that curie is a unit of radioactivity. It is a non SI unit. This unit was named in honour of Pierre Curie or Marie Curie both. It is calculated in decays per second. Radioactivity is defined as the energy loss due to radiation that is emitted from unstable nuclei of an atom.

Complete answer:
We can define one curie as $3.7\times {{10}^{10}}$ decays per second.

Therefore, from the options given above, option $(A)$ is correct.

Additional Information:
We also know that curry is widely used in medicine and government in the United States of America and in other countries also.
We should also have some basics of radioactivity. Radioactivity is defined as the energy loss due to radiation that is emitted from unstable nuclei of an atom. SI unit of radioactivity is becquerel $(Bq)$. Atoms of Plutonium and Uranium are highly unstable and undergo radioactivity. Only certain types of atoms emit radiation. There are three forms of radioactive decay:-
$(i)$ Alpha decay- In alpha particle decay heavy or unstable atomic nuclei emit a helium nucleus. It occurs only in heaviest of the atoms such as in Uranium and Thorium.
$(ii)$Beta decay- In beta particle decay the heavy or unstable atomic nuclei radiations consist of electrons.
$(iii)$Gamma decay- In gamma decay, photons having very high energies are emitted.
Following are the uses of Radioactivity:-
$(i)$Radioactivity is used to produce electricity.
$(ii)$Radioactivity is used to sterilize medical instruments.
$(iii)$It is also used to diagnose and cure diseases.
$(iv)$It is used in smoke detectors.

Note:
We should remember that the SI unit of radioactivity is becquerel and not curie. We should always remember that $1Ci=3.7\times {{10}^{10}}Bq$ . It should also be noted that Rutherford is another unit of radioactivity.