Question

What is relation between following units: Ru and Ci
A.$1Ci = 3.7 \times {10^4}Ru$
B.$1Ci = 3.9 \times {10^4}Ru$
C. $1Ci = 4.3 \times {10^4}Ru$
D. None of these

Answer 1

The mechanism by which an unstable atomic nucleus loses energy by radiation is known as radioactive decay. A material with unstable nuclei is referred to as "radioactive." Alpha decay, beta decay, and gamma decay are three of the most common forms of decay, all of which include the emission of one or more particles or photons.

Complete answer: The phenomenon of radioactivity is exhibited by the nuclei of an atom as a result of nuclear instability. In the year 1896, Henry Becquerel discovered this phenomenon. Radioactivity occurs as the nucleus of an unstable atom loses energy by emitting radiation. The particles released from nuclei as a result of nuclear instability are referred to as radioactivity. The curie unit was used to measure the amount of radioactivity (Ci). It was originally equal to one gram of $radium - 226$ . Curie =${\text{ }}3.7 \times {10^{10}}$ radioactive decays per second was recently described.
Now coming to the question:
The rate at which a material transforms into its daughter nucleus is used to determine its radioactivity. It was calculated using the radium disintegration scale.
Disintegrations per second $\left( {dps} \right)$ or Becquerel is the SI unit of operation.
$1Curie(\therefore 1Ci = 3.7 \times {10^{10}}dps) = 3.7 \times {10^{10}}dps = 3.7 \times {10^{10}}becquerel = 3.7 \times {10^4}$
$Rutherford(\therefore 1Rd = {10^6}dps)$
So, the correct option is: (A) $1Ci = 3.7 \times {10^4}Ru$

Note:
Here one should know about the radioactivity radiation is that the number of decays per second determines the activity, not the form of decay, the energy of the decay products, or the biological effects of the radiation.