LUYỆN CHỦ ĐỀ Review 2: Reading đọc hiểu Lớp 10


VẬN DỤNG (50%)

  • 1Làm xong biết đáp án, phương pháp giải chi tiết.
  • 2Học sinh có thể hỏi và trao đổi lại nếu không hiểu.
  • 3Xem lại lý thuyết, lưu bài tập và note lại các chú ý
  • 4Biết điểm yếu và có hướng giải pháp cải thiện

Read the passage and do the tasks that follow.

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.