Question

Which of the following changes the activity of radioisotope?
A. Temperature
B. Pressure
C. Chemical environment
D. None of the above

Answer 1

Hint:In this question we will understand about radioisotopes and whether these listed factors affect them or not. And radioisotopes are radioactive isotopes of an element. These are the atoms which containṣ an unstable combination of neutrons and protons.

Complete answer:
At first what an isotope is: Isotopes are the two or more types of atoms that have the same atomic number and position in the periodic table, and which differ in nucleon numbers because of different numbers of neutrons in their nuclei.

Radioisotope:Radioisotopes are known as radioactive isotopes of an element. They can be also defined as atoms which contain an unstable combination of neutrons and protons, or have excess energy in their nucleus.

Radioactive decay is a naturally occurring property of an element and artificially produced isotopes of the elements. The half-life is expressed as the rate at which the radioactive element decays, that is the time required for one-half life of any given quantity of the isotope to decay.

Now, lets us discuss the given points in answer:
Temperature:we know that the temperature is a physical quantity which expresses the feeling of hot and cold. It is the exhibition of thermal energy, present in all matter, which is the source of the occurrence of heat.

Pressure:We know that pressure is defined as the force applied perpendicular to the surface of an object per unit area and Pascal is the unit of pressure.

Chemical environment: Chemical environments are exposed in which the strong concentration of dangerous gases, fumes, highly corrosive or chemicals touch the surface.So, from all above explanations we can conclude that radioisotopes do not depend upon all the above external factors.

Hence, option D is correct.

Note:Remember the definition of radioisotope and their properties and controlled radioactive decay is used for the production of electricity by disintegrating uranium atoms and nuclear reactions can become uncontrolled if we do not take proper care in reducing the decay rate.