Why in the News?

The Telecom Regulatory Authority of India (TRAI) released its recommendations on the Tera Hertz Spectrum.

About Tera Hertz (THz) Spectrum

The THz Spectrum refers to a range of electromagnetic waves with frequencies between 100 GHz (gigahertz) and 10 THz (terahertz).

- This spectrum lies between microwaves and infrared light.
- It is known as the “THz gap” because it has been less explored compared to other parts of the electromagnetic spectrum.

- Unique Properties: THz waves can pass through many materials like clothing, paper, and wood but are absorbed by water and metals.
- Applications: Used for advanced technologies like imaging, communications, and spectroscopy.
- Potential Uses: Security scanning, medical imaging, and high-speed wireless communication.

THEA will encourage innovation in Tera Hertz technologies, supporting the ‘Make in India’ initiative.
The opening of specific frequency bands will boost the development and deployment of next-generation wireless technologies and automotive safety systems in India.

[2020] 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:

(a) 1, 2 and 3 only

(b) 1, 2 and 4 only

(d) 2, 3 and 4 only