CBSE 2024 · Region 5 · Set 1 · Q26 · 3 marks
(a)Name the parts of the electromagnetic spectrum which are (i) also known as 'heat waves' and (ii) absorbed by ozone layer in the atmosphere.(b)Write briefly one method each, of the production and detection of these radiations.
(a)
Name the parts of the electromagnetic spectrum which are (i) also known as 'heat waves' and (ii) absorbed by ozone layer in the atmosphere.
(b)
Write briefly one method each, of the production and detection of these radiations.
Marking-scheme solution
(i)
Infrared waves
(ii)
Ultraviolet rays
(b)
Method of production:
Infrared waves: hot bodies / vibration of atoms and molecules
Ultraviolet rays: special UV lamps / Sun / very hot bodies
Method of detection:
Infrared waves: thermopiles / IR photographic film / bolometer
Ultraviolet rays: photocells / photographic film
Electromagnetic WavesElectromagnetic SpectrumRemembershort_answereasy
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CBSE Class 12 Physics past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.