CBSE 2026 · Region 2 · Set 2 · Q24 · 3 marks
Name the electromagnetic waves which are used $\displaystyle 3$(i)as a diagnostic tool in medicine(ii)in remote switches for TV sets(iii)in water purifiers Also write their wavelength range.
Name the electromagnetic waves which are used $\displaystyle 3$
(i)
as a diagnostic tool in medicine
(ii)
in remote switches for TV sets
(iii)
in water purifiers Also write their wavelength range.
Marking-scheme solution
(i)
X-rays
Wavelength range: $\displaystyle 1$ nm to $\displaystyle 10^{-3} \mathrm{~nm}$
(ii)
Infrared waves
Wavelength range: $\displaystyle 1$ mm to $\displaystyle 700$ nm
(iii)
Ultraviolet waves
Wavelength range: $\displaystyle 400$ nm to $\displaystyle 1$ nm
Electromagnetic WavesElectromagnetic SpectrumRemembershort_answereasy
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CBSE Class 12 Physics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.