Consider the following types of electromagnetic radiation: radiowaves, infra-red, visible light. Which of the following statements are correct?
(i) Only radiowaves 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 human.
Text Solution
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(i) Audio information can be transmitted in the from of optical waves through optical fibres.
(ii) Very hot objects emit not only infraired radiation but also emit visible radiation
(iii) Humans can detect infrared radiations by feeling the heat on the portion of body exposed by radiations.
Therefore, all the given statements are not completely correct. Hence the option is correct.
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