The phenomenon in which certain elements emit invisible radiations is called:
Correct answer: B. Radioactivity
- A. Spectroscopy
- B. Radioactivity
- C. Gravimetery
- D. Chromatography
Explanation
Radioactivity is the phenomenon of the spontaneous disintegration of unstable atomic nuclei to atomic nuclei to form more energetically stable atomic nuclei. Radioactive decay is a highly exoergic, statistically random, first-order process that occurs with a small amount of mass being converted to energy. Spectroscopy is the study of the absorption and emission of light and other radiation by matter. Gravimetric analysis is a type of lab technique used to determine the mass or concentration of a substance by measuring a change in mass. chromatography, technique for separating the components, or solutes, of a mixture on the basis of the relative amounts of each solute distributed between a moving fluid stream, called the mobile phase, and a contiguous stationary phase.
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Atomic nuclei contain protons and neutrons, with nuclear size, mass defect and binding energy describing their stability. The work covers alpha, beta and gamma decay, decay equations, half-life and decay rate, along with radiation safety and medical applications such as imaging, radiotherapy and tracers.
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