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Physics · 2023 · 2 marks
CBSE 2023 · Region 5 · Set 2 · Q21
Identify the electromagnetic radiation and write its wavelength range, which is used to kill germs in water purifier. Name the two sources of these…
Identify the electromagnetic radiation and write its wavelength range, which is used to kill germs in water purifier. Name the two sources of these radiations.
Marking-scheme solution
Ultraviolet raysWavelength range $\displaystyle 4\times10^{-7}\,\text{m} - 6\times10^{-10}\,\text{m}$Sources :1. The Sun2. Any device in which inner shell electrons in atoms move from one energy level to a lower level.
All Electromagnetic Waves questions2023 question paperNCERT solutions: Electromagnetic WavesPractice Electromagnetic Waves →
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CBSE Class 12 Physics past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.