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With reference to Visible Light Communication (VLC) technology, which of the following statements are correct? 1. VLC uses the 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:

With reference to Visible Light Communication (VLC) technology, which of the following statements are correct? 1. VLC uses the 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: Correct Answer 1, 3 and 4 only

The correct answer is 1, 3 and 4 only.

  • Visible Light Communication Technology
    • It is a wireless method that enables high-speed transmission of data with visible light.
    • It makes use of Visible Light spectrum. It occupies the spectrum from 380 nm to 750 nm. Hence statement 1 is correct.
    • It enables high-speed internet access primarily in the indoor environment.
    • It works on the principle of intensity modulation of existing solid-state lighting infrastructure often provided by light-emitting diodes.
    • The data is transmitted by modulating the intensity of light given off by a light source and the signal is received by a photodiode device that transforms the data into forms that are readily-consumed by end-users.
    • VLC systems operate at optical frequencies and emit no electromagnetic interference. Therefore, it can be used in Healthcare services. Hence statement 4 is correct.
  • Advantage of this technology-
    • The size of the visible light spectrum which is 10,000 times larger than the entire radio spectrum.
    • Light travels 186,000 miles per second, which is much faster than the 344 meters per second travelled by radio waves in air.
  • The nature of light is that it is unable to pass through opaque walls. Hence, VLCT is used in indoor environment/short range. Hence statement 2 is not correct.
  • Li-Fi stands for Light-Fidelity. It is a technology under VLCT. It can transmit enormous amounts of data through LEDs (Light Emitting Diodes).
  • Li-Fi can transmit large amounts of data faster than Bluetooth and wi-fi. Hence statement 3 is correct.

Related Questions

Consider the following statements about visible light, UV light and X-ray.
1. The wavelength of visible light is more than that of X-ray.
2. The energy of X-ray photons is higher than that of UV light photons.
3. The energy of UV light photons is less than that of visible light photons.
Which of the statement(s) given above is/are correct?
The five addresses are given below. Which two addresses are exactly the same? 1. Mr. K. Raghuramiaya, K-379, Guntakalpkam, Fortbridge Street, Telampuram - 375 612 2.Mr. K. Raghuramaiya, K-379, Guntakalpkam, Fortbridge Street, Telampuram - 375 612 3.Mr. K. Raghuramiaya, K-379, Guntaklapkam, Fortbridge Street, Talempuram - 375 612 4.Mr. K. Raghuramaiya, K-379, Guntakalpkam, Fortbridge Street, Telampuram - 375 612 5. Mr. K. Raghuramaiya, K-379, Guntakalpakam, Fortbridge Street, Talempuram - 375 612
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With reference to 'LiFi' recently in the news, which of the following statements is/are correct? 1. It uses light as the medium for high-speed data transmission. 2. It is a wireless technology and is several times faster than 'WiFi'. Select the correct answer using the code given below
The moon looks blood red during a total lunar eclipse because some of the sunlight passes through Earth’s atmosphere to reach the moon. As the white light breaks up while passing through the atmosphere, most of its blue-colored wavelengths are absorbed and scattered. The remaining red wavelengths light up the moon in blood-red color. Which of the following statements do not support the assertion of the above-given statement? I: The moon looks blood red during a total lunar eclipse as the white light breaks up due to the Earth's atmosphere where most of its red-colored wavelengths are absorbed. II: The moon looks blood red during a total lunar eclipse as the earth blocks the white light to travel to the moon.
With reference to 'Near Field Communication (NFC) Technology', which of the following statements is/are correct? 1. It is a contactless communication technology that uses electromagnetic radio fields. 2. NFC is designed for use by devices which can be at a distance of even a metre from each other. 3. NFC can use encryption when sending sensitive information. Select the correct answer using the code given below.
The 2018 Nobel Prize in Physics has been awarded in laser physics for the optical tweezers and their applications to biological systems for the method of generating high-intensity, ultra-short optical pulses. Which of the following verifies the given statement? I:  The 2018 Nobel Prize in Physics has been awarded in laser physics for the optical tweezers. II: The 2018 Nobel Prize in Physics has been awarded for applications of the optical tweezers to biological systems. III: The 2018 Nobel Prize in Physics has been awarded for the method of generating high-intensity, ultra-short optical pulses using the optical tweezers.
Which of the following statements are true?
Statement I Big data refers to no precise quantity, but generally refers to data in the range of Petabytes and Exabyte, i.e. billions to trillions of records, all from various sources. Big data is generated much faster. than traditional data in much larger quantities.
Statement II Big data interests industries because they are able to learn more patterns and curious variances than smaller data sets, with the capability to provide valuable insights into consumer behaviour, weather systems, financial market activity, or other phenomena.
Statement III Various departments and product lines use various applications within most organisations and store data in separate datasets. These separate databases may contain similar data, but data from one data base to another is not always consistent. This is called data silo.
With reference to street-lighting, how do sodium lamps differ from LED lamps? 1. Sodium lamps produce light in 360 degrees but it is not so in the case of LED lamps. 2. As street lights, sodium lamps have a longer life span than LED lamps. 3. The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street lighting. Select the correct answer using the code given below.  
Some of the physical and functional advantages of optical fiber communication are mentioned here. Select the option which tells about the functional advantages of optical fiber communication. I. The transmission bandwidth of the fiber optic cables is higher than the metal cables. II. Since these cables are di-electric, no spark hazards are present. III. Fibre optic cables last longer than copper cables. IV. The amount of data transmission is higher in fiber optic cables. V. Fibre optic cables are immune to electromagnetic interference. VI. These are not affected by electrical noise.