Consider the following statements:Some rare earth elements are used in the manufacture of flat telev

Question

Consider the following statements:Some rare earth elements are used in the manufacture of flat television, screens and computer monitors,Some rare earth elements have phosphorescent properties.Which one of the following is correct in respect of the above statements?

Accepted Answer

Rare earth elements (REEs) are a group of 17 metallic elements, including the lanthanides, scandium, and yttrium, known for their unique properties like magnetism, luminescence, and conductivity. These elements are crucial components in various technologies, from consumer electronics to clean energy and medical devices. While relatively abundant in the Earth's crust, they are often dispersed and difficult to extract in concentrated quantities, hence the term "rare earth". Statement I is correct: Rare earth elements such as europium, terbium, and yttrium are used in the manufacture of flat-screen TVs and computer monitors, particularly in the color displays. Statement II is correct and explains statement I: These rare earths have phosphorescent (or luminescent) properties, which means they emit light when excited by energy—this property is essential for producing vivid colors in display technologies. Hence option (a) is the correct answer.