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Physics · 2026 · 3 marks
CBSE 2026 · Region 2 · Set 3 · Q27
Name the electromagnetic waves which are (i) also known as 'heat waves', (ii) used in LASIK eye surgery, (iii) used to destroy cancer cells. Also…
Name the electromagnetic waves which are (i) also known as 'heat waves',
(ii)
used in LASIK eye surgery, (iii) used to destroy cancer cells. Also write their wavelength range.
Marking-scheme solution
(i)
Infrared waves
Wavelength range: $\displaystyle 1$ mm to $\displaystyle 700$ nm
(ii)
Ultraviolet rays
Wavelength range: $\displaystyle 400$ nm to $\displaystyle 1$ nm
(iii)
Gamma rays
Wavelength range: $\displaystyle <10^{-3} \mathrm{~nm}$
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CBSE Class 12 Physics past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.