Consider the following types of electromagnetic radiations ; radio waves, infrared, visible light. Which of the following statements are correct?
i) Only radio waves can be used to transmit audio information
ii) Only infrared radiation is emitted by very hot object.
iii) Only visible light can be detected by humans

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Only (i) is correct

Only (ii) is correct

Only (iii) is correct

None of the above is correct

answer is D.

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Detailed Solution

I) Audio information can be transmitted in the form of optical waves through optical fibres
II) very hot objects emit not only infrared radiation but also emit visible radiation
III) Humans can defect infrared radiations by the heat on the portion of body exposed by radiations.
There fore, all the given statements are not completely correct. Hence the option 4 is correct

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