Consider the following statements:
Statement I: Some rare earth elements are used in the manufacture of flat television screens and computer monitors.
Statement II: Some rare earth elements have phosphorescent properties
Which one of the following is correct in respect of the above statements?
- A.Both Statement I and Statement II are correct and Statement II explains Statement I
- B.Both Statement I and Statement II are correct but Statement II does not explain Statement I
- C.Statement I is correct but Statement II is incorrect
- D.Statement I is incorrect but Statement II is correct
▶ Answer & Explanation
Correct answer: A. Both Statement I and Statement II are correct and Statement II explains Statement I
Rare earth elements possess unique luminescent properties, including phosphorescence, which are essential for their application in display technologies. These properties allow them to emit light when excited, making them ideal for creating the vibrant colours seen in flat-screen televisions and computer monitors. Therefore, the phosphorescent nature of some rare earth elements directly explains their use in these electronic devices.
Source: UPSC gs1 2025