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PYQs: Radioactivity Video Lecture | Physical Chemistry
FAQs on PYQs: Radioactivity Video Lecture - Physical Chemistry
| 1. What is radioactivity? |  |
Ans. Radioactivity is the spontaneous emission of radiation from the nucleus of an unstable atom. It occurs when the nucleus undergoes radioactive decay, releasing energy in the form of alpha particles, beta particles, or gamma rays.
| 2. How does radioactivity occur? | |
Ans. Radioactivity occurs when the nucleus of an atom is unstable and undergoes radioactive decay. This decay can happen through several processes, such as alpha decay, beta decay, or gamma decay. These processes result in the emission of radiation from the atom.
| 3. What are the types of radiation emitted during radioactivity? | |
Ans. There are three types of radiation emitted during radioactivity: alpha particles, beta particles, and gamma rays. Alpha particles consist of two protons and two neutrons and have a positive charge. Beta particles can be either electrons or positrons and have a negative or positive charge, respectively. Gamma rays are electromagnetic radiation with high energy and no charge.
| 4. How is radioactivity measured? | |
Ans. Radioactivity is measured using a unit called the becquerel (Bq) or the curie (Ci). The becquerel is the SI unit of radioactivity and measures the number of radioactive decays per second. The curie is a non-SI unit commonly used in the United States, where 1 curie is equal to 3.7 x 10^10 becquerels.
| 5. What are the applications of radioactivity? | |
Ans. Radioactivity has various applications in different fields. In medicine, it is used in diagnostic imaging techniques like X-rays and PET scans. Radioactive isotopes are also used in cancer treatment through radiation therapy. In industry, radioactivity is employed in techniques like radiography for quality control and in detecting leaks in pipelines. Additionally, it is used in scientific research, archaeology, and environmental monitoring.
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