Which of the following statements is are incorrect 1 Near Field communication Technology is a contac...........

Science Affairs Information Technology

Which of the following statements is/are incorrect ?

1. Near Field communication Technology is a contactless communication that uses radio waves for communication.

2. Bluetooth is a kind of wide area network that uses 2.4 GHz radio frequency for communication.

3. One of the disadvantages of Li-Fi is that it is effective for short range only because of less penetrability in solids.

Select the correct answer using the codes given below:

1 only

1 and 3 only

2 only

2 and 3 only

छोटे Courses बड़े Results

Master Information Technology

Prepare through Micro-courses

Try Now

Explanation:

Statement 2 is incorrect: Bluetooth is a kind of personal area network that uses 2.4 GHz radio frequency for communication. Supplementary notes: Near Field Communication (NFC) It is a contactless communication that uses radio waves for communication. It’s a new standard of wireless communication. It enables users to transmit radio frequency wave over a very short distance just about few centimeters Since it’s a very short-range communication, power consumption is very negligible or no power consumption. It can transfer low amount of data between devices enabled with NFC. No need of pairing the devices, its ready to use at just a click or swipe. Bluetooth technology Bluetooth is a proprietary open wireless technology standard for exchanging data over short distances (using short wavelength radio transmissions in the ISM band from 2400-2480 MHz) from fi xed and mobile devices, creating Personal Area Networks (PANs) with high levels of security.
List of applications of Bluetooth:
Wireless control of and communication between a mobile phone and a handsfree headset
Wireless Bluetooth headset and Intercom.
Wireless networking between PCs in a confined space and where little bandwidth is required.
Wireless communication with PC input and output devices, the most common being the mouse, keyboard and printer.
Transfer of fi les, contact details, calendar appointments, and reminders between devices with OBEX. Li-Fi
Li-Fi means light fi delity
Li-Fi is a wireless communication, high speed and bidirectional.
It’s similar to WiFi but not a radio frequency wave communication. It’s a visual light communication where visible light has the capacity to transmit the data. A dedicated LED light so developed emits a visible range light. The reach of light is the range of Li-Fi communication.
Internet connectivity would become simpler and higher bandwidth of Li-Fi can render cost effective and effi cient data communication.
Most importantly Li-Fi is high security bene fi ts. Light communication can’t be intercepted unlike electromagnetic waves. Hence its secure mode of communication.
Since light can’t pass through obstacles like walls and barriers, Li-Fi can’t work beyond it. It limited to visible range of light. It provides one point solution to signal solution. In offi ces a merely LED bulb can work as network generator.