{"id":1446,"date":"2024-02-18T13:07:02","date_gmt":"2024-02-18T07:37:02","guid":{"rendered":"https:\/\/lotusarise.com\/qna\/?p=1446"},"modified":"2024-04-03T07:09:47","modified_gmt":"2024-04-03T01:39:47","slug":"q-with-reference-to-lifi-recently-in-the-news-which-of-the-following-statements-is-are-correct","status":"publish","type":"post","link":"https:\/\/lotusarise.com\/qna\/upsc\/q-with-reference-to-lifi-recently-in-the-news-which-of-the-following-statements-is-are-correct","title":{"rendered":"Q.\u00a0With reference to \u2018LiFi\u2019, recently in the news, which of the following statement(s) is\/are correct?"},"content":{"rendered":"\n
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  1. It uses light as the medium for high speed data transmission.<\/li>\n\n\n\n
  2. It is a wireless technology and several times faster than<\/strong> \u2018WiFi\u2019.<\/li>\n<\/ol>\n\n\n\n

    Select the correct answer using the code given below.<\/p>\n\n\n\n

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    • 1 only<\/li>\n\n\n\n
    • 2 only<\/li>\n\n\n\n
    • Both 1 and 2<\/li>\n\n\n\n
    • Neither 1 nor 2<\/li>\n<\/ul>\n\n\n\n
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      Answer: (c) Both 1 and 2<\/strong><\/p>\n<\/blockquote>\n\n\n\n

      LiFi (Light Fidelity)<\/h5>\n\n\n\n
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      • LiFi (Light Fidelity<\/strong>) is a wireless communication<\/strong> technology that uses visible light,<\/strong> particularly LED bulbs, to transmit data.\n
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        • It was first demonstrated in 2011 <\/strong>by Professor Harald Haas<\/strong> from the University of Edinburgh, Scotland, who also coined the term LiFi.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
        • It provides high-speed, bidirectional, networked mobile communication<\/strong> in a similar manner as WiFi but with higher speeds, lower latency, and a larger bandwidth (thousands of terahertz).<\/li>\n\n\n\n
        • LiFi has the advantage of being useful in electromagnetic-sensitive areas like aircraft cabins, hospitals,<\/strong> and nuclear power plants<\/strong> without causing electromagnetic interference<\/strong>. Its utilisation of unused visible lights in human life has opened up new opportunities in wireless communications technology.<\/li>\n<\/ul>\n\n\n\n
          Parameter<\/strong><\/th>LiFi<\/strong><\/th>WiFi<\/strong><\/th><\/tr><\/thead>
          Technology<\/strong><\/td>Visible Light Communication<\/td>Radio waves<\/td><\/tr>
          Frequency Band<\/strong><\/td>430 \u2013 770 THz<\/td>2.4 GHz, 5 GHz<\/td><\/tr>
          Max Speed<\/strong><\/td>Up to 224 Gbps<\/td>Up to 54 Mbps (802.11ax)<\/td><\/tr>
          Latency<\/strong><\/td>Low, <1 ms<\/td>Medium, >10 ms<\/td><\/tr>
          Security<\/strong><\/td>High, confined to the area illuminated<\/td>Medium, can penetrate walls<\/td><\/tr>
          Energy Efficiency<\/strong><\/td>High, uses LEDs<\/td>Medium<\/td><\/tr>
          Reliability<\/strong><\/td>High, less interference<\/td>Prone to interference<\/td><\/tr>
          Mobility Support<\/strong><\/td>Limited, needs line of sight<\/strong><\/td>Good<\/td><\/tr>
          Outdoor use<\/strong><\/td>Challenging due to sunlight<\/td>Excellent<\/td><\/tr>
          Health hazard<\/strong><\/td>None<\/td>Concerns about radiofrequency radiation<\/td><\/tr>
          Deployment costs<\/strong><\/td>Low, leverages lighting infrastructure<\/td>High for WiFi routers<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
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