With reference to Visible Light Communication (VLC) technology, which of the following statements are correct? 1. VLC uses electromagnetic spectrum wavelengths 375 to 780 nm. 2. VLC is known as long-range optical wireless communication. 3. VLC can transmit large amounts of data faster than Bluetooth. 4. VLC has no electromagnetic interference. Select the correct answer using the code given below:
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A hard Science & Technology multiple-choice question from UPSC Prelims 2020. Attempt it above, then check the correct answer and detailed explanation below.
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Correct answer: C. 1, 3 and 4 only
Statements 1, 3 and 4 are correct — VLC uses the visible-light band (375-780 nm), can transmit data faster than Bluetooth and is free of electromagnetic interference. Statement 2 is wrong — VLC is a short-range technology.
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