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Li-Fi Technology

   Li-Fi technology is a new technology that transmits signals as light instead of radio waves. In urban areas where Wi-Fi networks become congested and there is a lot of noise in the signals, this technology is something that can be of immense use to an individual. The basic requirement of this technology is the available of light!

    Light is also an electromagnetic wave like radio waves. The only difference is that the former  has the ability to transmit data almost ten thousand times faster than latter! The basic process is quite simple to understand. An LED light bulb, any one at all, can be flicked on and off in order to be able to generate signals. A light sensor on a device picks up the digital information sent by the LED, which enables it to be processed by a computer.

     The question is whether anyone wants to go through the annoying experience of sitting under a flickering light bulb. This is the interesting part. The technology is focusing on make sure that the light bulb is flickered up to billions of times a second!  At that rate, the human eye simply cannot notice the light bulb being flicked on and off.

     However, everything comes with a disadvantage. The major disadvantage here is the fact that these signals cannot penetrate walls. So if you want to move from one room to another, you will need to have a wired bulb present in that room as well.

   An Estonian startup company called Velmenni took the technology out of the laboratories and brought it into the real-world offices, and industrial environments in Tallinn for the first time.

    Overall, this sounds like quite a development in the field of communication technology.

Read the passage and choose the best answer.

When the era of digital technology has bloomed all over the world, human beings have witnessed thousands of wonderful inventions which can be applied in a variety of fields. Among those, robots are considered as a brilliant human creativity and have been developed further to serve people. Shaped into human bodies, robots are machines built to do tasks. Normally, they can be controlled by built-in computers so that they can do a series of automatic actions. These human-like machines help us explore new places, and uncover the mystery of the deep and cold ocean which is very dangerous for a normal body. They seem to play an unlimited role not only in exploration, but in medical fields as well. In hospitals, they can do a wide range of jobs in cooperation with doctors to improve the health care system. For instance, robots can assist physicians remotely to check on patients and even inspect them. They can search around hospitals to collect information about the sick and transmit it to the doctors through a screen to help them interact efficiently. With cutting-edge technology they can even do an operation with a high level of accuracy under professionals’ control. Thanks to robotic assistants, medical workers can save time and save many lives from fatal diseases. It is believed that the number of robots applied in the medical industry will be expected to increase dramatically over the next few years.

What is the passage mainly about?

Read the passage and choose the best answer.

When the era of digital technology has bloomed all over the world, human beings have witnessed thousands of wonderful inventions which can be applied in a variety of fields. Among those, robots are considered as a brilliant human creativity and have been developed further to serve people. Shaped into human bodies, robots are machines built to do tasks. Normally, they can be controlled by built-in computers so that they can do a series of automatic actions. These human-like machines help us explore new places, and uncover the mystery of the deep and cold ocean which is very dangerous for a normal body. They seem to play an unlimited role not only in exploration, but in medical fields as well. In hospitals, they can do a wide range of jobs in cooperation with doctors to improve the health care system. For instance, robots can assist physicians remotely to check on patients and even inspect them. They can search around hospitals to collect information about the sick and transmit it to the doctors through a screen to help them interact efficiently. With cutting-edge technology they can even do an operation with a high level of accuracy under professionals’ control. Thanks to robotic assistants, medical workers can save time and save many lives from fatal diseases. It is believed that the number of robots applied in the medical industry will be expected to increase dramatically over the next few years.

The word cutting-edge is closest in meaning to _____________.

Read the passage and choose the best answer.

When the era of digital technology has bloomed all over the world, human beings have witnessed thousands of wonderful inventions which can be applied in a variety of fields. Among those, robots are considered as a brilliant human creativity and have been developed further to serve people. Shaped into human bodies, robots are machines built to do tasks. Normally, they can be controlled by built-in computers so that they can do a series of automatic actions. These human-like machines help us explore new places, and uncover the mystery of the deep and cold ocean which is very dangerous for a normal body. They seem to play an unlimited role not only in exploration, but in medical fields as well. In hospitals, they can do a wide range of jobs in cooperation with doctors to improve the health care system. For instance, robots can assist physicians remotely to check on patients and even inspect them. They can search around hospitals to collect information about the sick and transmit it to the doctors through a screen to help them interact efficiently. With cutting-edge technology they can even do an operation with a high level of accuracy under professionals’ control. Thanks to robotic assistants, medical workers can save time and save many lives from fatal diseases. It is believed that the number of robots applied in the medical industry will be expected to increase dramatically over the next few years.

A robot can be operated by _____________.

Read the passage and choose the best answer.

When the era of digital technology has bloomed all over the world, human beings have witnessed thousands of wonderful inventions which can be applied in a variety of fields. Among those, robots are considered as a brilliant human creativity and have been developed further to serve people. Shaped into human bodies, robots are machines built to do tasks. Normally, they can be controlled by built-in computers so that they can do a series of automatic actions. These human-like machines help us explore new places, and uncover the mystery of the deep and cold ocean which is very dangerous for a normal body. They seem to play an unlimited role not only in exploration, but in medical fields as well. In hospitals, they can do a wide range of jobs in cooperation with doctors to improve the health care system. For instance, robots can assist physicians remotely to check on patients and even inspect them. They can search around hospitals to collect information about the sick and transmit it to the doctors through a screen to help them interact efficiently. With cutting-edge technology they can even do an operation with a high level of accuracy under professionals’ control. Thanks to robotic assistants, medical workers can save time and save many lives from fatal diseases. It is believed that the number of robots applied in the medical industry will be expected to increase dramatically over the next few years.

In the field of science, a robot can assist scientists in _____________.

Read the passage and choose the best answer.

When the era of digital technology has bloomed all over the world, human beings have witnessed thousands of wonderful inventions which can be applied in a variety of fields. Among those, robots are considered as a brilliant human creativity and have been developed further to serve people. Shaped into human bodies, robots are machines built to do tasks. Normally, they can be controlled by built-in computers so that they can do a series of automatic actions. These human-like machines help us explore new places, and uncover the mystery of the deep and cold ocean which is very dangerous for a normal body. They seem to play an unlimited role not only in exploration, but in medical fields as well. In hospitals, they can do a wide range of jobs in cooperation with doctors to improve the health care system. For instance, robots can assist physicians remotely to check on patients and even inspect them. They can search around hospitals to collect information about the sick and transmit it to the doctors through a screen to help them interact efficiently. With cutting-edge technology they can even do an operation with a high level of accuracy under professionals’ control. Thanks to robotic assistants, medical workers can save time and save many lives from fatal diseases. It is believed that the number of robots applied in the medical industry will be expected to increase dramatically over the next few years.

According to the text, in hospitals robots can _____________.