Question:
Name the electromagnetic waves which are used (iii) in water purifiers. Also write their wavelength range.
Name the electromagnetic waves which are used (iii) in water purifiers. Also write their wavelength range.
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The immense energy carried securely by short-wavelength UV-C rays is biologically sufficient to aggressively shatter the DNA of microorganisms, rendering them completely sterile.
Updated On: Sep 14, 2026
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Solution and Explanation
Step 1: Identify the electromagnetic wave
The specific electromagnetic waves purposely utilized in modern water purifiers to actively destroy bacteria and deadly microbes are Ultraviolet (UV) rays.
Step 2: State the standard wavelength range
The recognized wavelength range rigorously assigned to Ultraviolet radiation safely falls between $400 \text{ nm}$ and $1 \text{ nm}$ (or exactly $4 \times 10^{-7} \text{ m}$ to $10^{-9} \text{ m}$).
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