Visible Light Communication (VLC)
Question
With reference to Visible Light Communication (VLC) technology, which of the following statements are correct? Select the correct answer using the code given below:
- 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.
Options
1, 2 and 3 only
1, 2 and 4 only
1, 3 and 4 only
2, 3 and 4 only
Explanation
VLC uses visible light (roughly 375 to 780 nm) for data transmission (Statement 1 is correct). However, light cannot easily penetrate walls and has a short range, making it a short-range, not long-range, communication technology (Statement 2 is incorrect). VLC (like Li-Fi) offers much higher bandwidth and faster data transmission speeds than Bluetooth (Statement 3 is correct). Since it uses visible light rather than radio waves, it causes no electromagnetic interference with sensitive electronics (Statement 4 is correct). > One-line conceptual takeaway: VLC (Li-Fi) is an ultra-fast, short-range, interference-free alternative to radio-based wireless communications. Answer: (c).
Question details
Year
2020
Paper
GS Paper 1
Question
Q39
Subject
Science & Technology
Sub-topic
Computing, AI & IT
Type
Statement-based
Difficulty
Medium
Nature
Static
Source hint
Li-Fi technology news
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