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Physics · 2024 · 3 marks
CBSE 2024 · Region 4 · Set 3 · Q27
Explain the following giving reasons: (i) 'Electromagnetic waves differ considerably in their mode of interaction with matter'. (ii) 'Food items to…
Explain the following giving reasons :
(i)
'Electromagnetic waves differ considerably in their mode of interaction with matter'.
(ii)
'Food items to be heated in microwave oven must contain water'.
(iii)
'Welders wear face mask with glasses during welding'.
Marking-scheme solution
(i)
Since they have different wavelengths and frequencies, they differ considerably in their mode of interaction with matter.
(ii)
The frequency of microwaves matches the resonant frequency of water molecules, so that energy from the wave is transferred to the water molecules.
(iii)
To protect their eyes from the large amount of ultraviolet rays produced by welding.
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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.