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Physics · 2024 · 3 marks
CBSE 2024 · Region 5 · Set 2 · Q25
Name the part of the electromagnetic spectrum which are (i) stopped by face mask worn by welders. (ii) used in detectors in Earth satellites. (iii)…
Name the part of the electromagnetic spectrum which are
(i)
stopped by face mask worn by welders.
(ii)
used in detectors in Earth satellites.
(iii)
used in 'short-wave band' in communication. Also write the order of wavelengths, in each case.
Marking-scheme solution
(i)
Ultraviolet rays
Order of wavelength $\displaystyle 400$ nm – $\displaystyle 1$ nm
(ii)
Infrared waves
Order of wavelength $\displaystyle 1$ mm – $\displaystyle 700$ nm
(iii)
Radio waves
Order of wavelength $\displaystyle >0.1 \mathrm{~m}$
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CBSE Class 12 Physics past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.